Platform ROAS measures attributed revenue against media spend. It does not automatically account for margin, discounts, returns, agency cost, creative cost, or sales that would have happened anyway.
Revenue is not contribution
Two campaigns with the same reported ROAS can produce opposite outcomes when product margin, fulfilment cost, and refund behavior differ. The economic denominator has to include the real cost of producing the sale.
Attribution can overstate incrementality
Platforms are designed to claim conversions, not prove that advertising caused them. Compare platform reporting with blended acquisition cost, new-customer revenue, and controlled lift wherever the data allows.
Build a business-level scorecard
Pair channel metrics with contribution after marketing, new-customer mix, payback period, and retained value. The account should optimize toward a business constraint, not a platform badge.
What to take away
- Calculate return after margin and variable costs.
- Separate new customers from captured existing demand.
- Use blended and incremental views beside platform ROAS.
