Acquisition Channel Advisor

Purpose

Guide product managers through evaluating whether to scale, test, or kill an acquisition channel based on unit economics (CAC, LTV, payback), customer quality (retention, NRR), and scalability (magic number, volume potential). Use this to make data-driven go-to-market decisions and optimize channel mix for sustainable growth.

This is not a channel strategy framework—it's a financial lens for channel evaluation that helps you avoid scaling unprofitable channels or killing channels with fixable problems. Use when deciding how to allocate marketing budget across channels.

Key Concepts

The Channel Evaluation Framework

A systematic approach to evaluate acquisition channels:

1. Unit Economics — What does it cost to acquire, and what's the return?

• CAC (Customer Acquisition Cost)
• LTV (Lifetime Value)
• LTV:CAC ratio
• Payback period

1. Customer Quality — Do customers from this channel stick around and expand?

• Cohort retention rate (by channel)
• Churn rate (by channel)
• NRR (Net Revenue Retention by channel)
• Expansion rate

1. Scalability — Can this channel sustain growth at the volume you need?

• Magic Number (S&M efficiency)
• Addressable volume (TAM of channel)
• Saturation risk (diminishing returns)
• CAC trend (increasing, stable, decreasing)

1. Strategic Fit — Does this channel align with your go-to-market strategy?

• Customer segment match (SMB vs. enterprise)
• Sales motion compatibility (PLG vs. sales-led)
• Brand positioning alignment

Decision Matrix

| LTV:CAC | Payback | Customer Quality | Scalability | Decision | |---------|---------|------------------|-------------|----------| | >3:1 | 18mo | Poor retention | Low volume | Kill or fix |

Anti-Patterns (What This Is NOT)

• Not vanity metrics: "We got 10,000 signups!" means nothing if they churn in 30 days
• Not CAC-only thinking: Low CAC with terrible retention is worse than high CAC with great retention
• Not ignoring payback: 5:1 LTV:CAC with 36-month payback is a cash trap
• Not scaling broken channels: Pouring money into inefficient channels accelerates failure

When to Use This Framework

Use this when:

• Evaluating whether to scale a new channel (content, paid, events, etc.)
• Deciding how to allocate marketing budget across channels
• Assessing whether to kill an underperforming channel
• Comparing channels to optimize ROI
• Planning annual marketing budget allocation

Don't use this when:

• Channel is brand-new (3:1 and payback 18 months: "Poor unit economics"

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Step 2: Assess Customer Quality

Agent asks:

"How do customers from this channel perform compared to other channels?

Retention & Expansion:

1. What's the churn rate for customers from this channel?

• Lower than blended (they stick around longer)
• Same as blended (no difference)
• Higher than blended (they churn faster)
• Unknown (need cohort analysis)

1. What's the NRR for customers from this channel?

• Higher than blended (they expand more)
• Same as blended (no difference)
• Lower than blended (they contract or churn more)
• Unknown (need cohort analysis)

1. What's the customer profile from this channel?

• Ideal customer profile (ICP) — perfect fit
• Close to ICP — mostly good fit
• Off ICP — many poor-fit customers
• Unknown"

Based on answers, agent evaluates:

• ✅ High quality: Lower churn, higher NRR, ICP match
• ⚠️ Medium quality: Similar to blended, mostly good fit
• 🚨 Low quality: Higher churn, lower NRR, off ICP

Agent flags:

• If high quality: "Premium channel—customers are better than average"
• If low quality: "Quality problem—customers aren't sticking or expanding"

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Step 3: Evaluate Scalability

Agent asks:

"Can this channel scale to meet your growth targets?

Efficiency & Volume:

1. What's the S&M efficiency for this channel (Magic Number)?

• Calculate: (New MRR from channel × 4) / Channel S&M Spend
• Or provide if known

1. What's the addressable volume for this channel?

• Large (can scale 10x+ from current spend)
• Medium (can scale 2-5x)
• Small (near saturation, maybe 1.5x)
• Unknown

1. What's the CAC trend for this channel?

• Decreasing (getting more efficient over time)
• Stable (consistent CAC)
• Increasing (diminishing returns, saturation)
• Unknown (too early to tell)

1. How much growth do you need from acquisition?

• We'll calculate: Target growth - expansion/retention growth = acquisition gap"

Based on answers, agent evaluates:

• ✅ Highly scalable: Magic number >0.75, large volume, stable/decreasing CAC
• ⚠️ Moderately scalable: Magic number 0.5-0.75, medium volume, stable CAC
• 🚨 Not scalable: Magic number 3:1 AND
• Payback 0.75 AND
• Addressable volume large

Recommendation:

"Scale this channel aggressively — Excellent economics + scalability

Unit Economics:

• CAC: $___
• LTV: $___
• LTV:CAC: ___:1 ✅ (>3:1 threshold)
• Payback: ___ months ✅ (0.75 = efficient)
• Addressable Volume: Large
• CAC Trend: [Stable / Decreasing]

Why this is a winner:

• Every $1 spent returns $__ in LTV
• Payback in under a year = fast cash recovery
• [Customer quality insight]
• Can scale 5-10x from current spend

How to scale:

1. Increase budget by 50-100% next month

• Current: $___ /month → Target: $___ /month

1. Monitor key metrics weekly:

• CAC (should stay 0.75)
• Customer quality (retention, NRR)

1. Scale until:

• CAC increases >20% (saturation signal)
• Magic Number drops 3:1, payback 18 months = cash trap)

Problem:

• You're spending $___ to acquire a customer worth $___
• [Losing money / Barely breaking even / Taking too long to recover cost]

Customer Quality:

• Retention: [Worse than blended]
• NRR: [Lower]
• ICP Fit: [Poor]

What's broken: [Specific diagnosis:]

• CAC too high (spending $___ vs. blended $___)
• LTV too low (customers churn at ___% vs. blended ___%)
• Both (bad unit economics from both sides)

Should you fix or kill?

Fix if:

• You have a hypothesis to improve CAC by 50%+ (better targeting, conversion)
• You have a hypothesis to improve LTV by 50%+ (better onboarding, ICP focus)
• This is a strategically important channel (e.g., enterprise requires field sales)

Kill if:

• No clear path to 3:1 LTV:CAC
• Better channels available (reallocate budget there)
• Small addressable volume (not worth fixing)

Recommendation: Kill and reallocate budget

Reallocate to:

• Channel X (LTV:CAC = ___:1, can scale)
• Channel Y (Magic Number = ___, efficient)

What to do with budget:

• Current channel spend: $___/month
• Reallocate to [top-performing channel]
• Expected impact: [better CAC, better LTV, faster payback]

Exception: If this channel is short-term ROI

Financial Reality:

• CAC: $___
• LTV: $___
• LTV:CAC: ___:1 (below 3:1 threshold)
• Payback: ___ months (long)

Why continue despite poor economics:

• [Strategic reason: e.g., "Enterprise segment requires field events, but deals are 12-month sales cycles"]
• [Brand building: e.g., "Conferences build brand awareness that drives inbound long-term"]
• [Market positioning: e.g., "Need to be present in this channel for credibility"]

How to manage:

1. Cap spend — Don't scale until economics improve

• Current: $___/month
• Cap at: $___/month (hold steady)

1. Track leading indicators — Don't just look at short-term CAC/LTV

• Pipeline influence
• Brand awareness lift
• Referral rate from this channel

1. Re-evaluate quarterly

• If economics improve (LTV:CAC >3:1): scale
• If economics stay poor: reconsider strategy

Timeline:

• Give it [6-12 months] to show results
• If no improvement: kill or reduce drastically

Risk: You're subsidizing growth. Make sure it's worth it."

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Step 5: Compare Across Channels (Optional)

If user has multiple channels, agent can generate:

| Channel | CAC | LTV | LTV:CAC | Payback | Magic Number | Quality | Recommendation | |---------|-----|-----|---------|---------|--------------|---------|----------------| | Google Ads | $500 | $2,000 | 4:1 | 8mo | 0.9 | High | Scale | | Content | $200 | $1,500 | 7.5:1 | 4mo | 1.2 | High | Scale | | Outbound | $10K | $50K | 5:1 | 18mo | 0.6 | Medium | Optimize | | Events | $15K | $30K | 2:1 | 24mo | 0.3 | Low | Kill |

Budget allocation recommendation:

1. Scale: Content (highest efficiency)
2. Scale: Google Ads (strong economics)
3. Optimize: Outbound (improve magic number)
4. Kill: Events (reallocate budget)

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Examples

See examples/ folder for sample conversation flows. Mini examples below:

Example 1: Scale (Content Marketing)

Channel: Organic content (blog, SEO)

• CAC: $200
• LTV: $3,000
• LTV:CAC: 15:1
• Payback: 3 months
• Magic Number: 1.8
• Customer quality: High (lower churn, higher NRR)

Recommendation: Scale aggressively. Exceptional unit economics, fast payback, high-quality customers. Increase content spend 2-3x.

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Example 2: Optimize (Paid Search)

Channel: Google Ads

• CAC: $800
• LTV: $2,000
• LTV:CAC: 2.5:1
• Payback: 14 months
• Magic Number: 0.6
• Customer quality: Lower (higher churn in first 90 days)

Recommendation: Test & optimize before scaling. CAC is high, onboarding is weak for this segment. Improve landing page, target higher-intent keywords, better onboarding for paid customers.

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Example 3: Kill (Trade Shows)

Channel: Industry events

• CAC: $20,000
• LTV: $30,000
• LTV:CAC: 1.5:1
• Payback: 30 months
• Magic Number: 0.2
• Customer quality: Low (off-ICP, many tire-kickers)

Recommendation: Kill. CAC too high, payback too long, poor customer quality. Reallocate budget to content and paid search.

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Common Pitfalls

Pitfall 1: Scaling Broken Channels

Symptom: "Let's 10x our Google Ads spend!" (LTV:CAC is 1.5:1)

Consequence: You accelerate cash burn without improving unit economics. Lose money faster.

Fix: Only scale channels with LTV:CAC >3:1 and payback 50% of new customer acquisition.

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Pitfall 9: Forgetting Incrementality

Symptom: "This retargeting campaign has great ROI!" (but customers would've converted anyway)

Consequence: You're paying for conversions that would happen organically. Inflated ROI.

Fix: Test incrementality with holdout groups. Only count truly incremental conversions.

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Pitfall 10: Strategic Channels Without Limits

Symptom: "Enterprise events are strategic, we can't stop!" (losing $500K/year)

Consequence: "Strategic" becomes an excuse for burning cash indefinitely.

Fix: Cap spend on strategic channels. Set timeline for improvement (6-12 months). If no progress, kill.

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References

Related Skills

• saas-economics-efficiency-metrics — CAC, LTV, payback, magic number calculations
• saas-revenue-growth-metrics — NRR, churn, cohort analysis by channel
• finance-metrics-quickref — Fast lookup for channel evaluation metrics
• feature-investment-advisor — Similar ROI framework for feature decisions
• business-health-diagnostic — Broader business health assessment

External Frameworks

• Brian Balfour (Reforge): Channel-product fit framework
• David Skok: "SaaS Metrics" — CAC, LTV, and payback for channels
• Tomasz Tunguz: SaaS channel benchmarking
• First Round Review: "How to Find and Scale Your Growth Channels"

Provenance

• Adapted from research/finance/Finance_For_PMs.Putting_It_Together_Synthesis.md (Decision Framework #2)
• Channel economics from research/finance/Finance for Product Managers.md

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: getcrew44
• Source: getcrew44/crew44
• License: MIT
• Homepage: https://crew44.io

Install and usage instructions live in the source repository linked above.