Case #009
High ROAS campaigns brought in customers. The dashboard looked profitable. But the cohort data told a different story — customers who never returned.
How the Illusion Builds
Day 1
Ad campaign shows 4x ROAS. Team celebrates. Budget increases.
Day 14
New customers are not returning for a second purchase.
Day 30
Cohort analysis shows 8% day-30 retention across acquired segments.
Day 90
Blended margin per acquired customer is negative. The ads looked profitable. The cohort is not.
ROAS vs LTV:CAC Reality
Margin Gap| Channel | ROAS (Day 1) | D30 Retention | LTV:CAC (90d) |
|---|---|---|---|
| Paid Social | 4.2x | 7% | 0.68x |
| Search Ads | 3.8x | 11% | 0.81x |
| Display | 5.1x | 4% | 0.44x |
| Email Acq. | 2.9x | 24% | 1.42x |
Avg ROAS
4.0x
Looks profitable
Avg D30 Retention
12%
Tells the truth
Avg LTV:CAC (90d)
0.59x
Negative margin
Evidence Detected
High ROAS dashboard
Ads reported strong return on spend — measured at day 1, not day 90.
Low day-30 retention
Most acquired customers never placed a second order.
Cohort collapse pattern
Every new acquisition cohort showed the same disappearance curve.
LTV:CAC below 1x
When measured over 90 days, the customer was worth less than what was paid to acquire them.
Root Cause
The business measured success at the point of first purchase. No system tracked what happened after the ad was paid for. The acquisition funnel was optimized. The retention funnel did not exist.
"
ROAS measures the ad. It doesn't measure the customer.
Case Conclusion
Acquisition Illusion
Problem
High ROAS campaigns masking low-LTV customer acquisition.
Cause
Measuring acquisition success at day 1, not day 90.
Action
Implement cohort-level LTV:CAC tracking per channel.
Investigator's Takeaway
A 4x ROAS means nothing if the customer was worth 1x. The acquisition looks efficient. The cohort is telling you the truth.
Don't be a victim of the illusion. Let's analyze your cohorts and uncover the truth.
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