ROAS is a diagnostic, not a strategy

If your weekly meeting opens with "what's ROAS?", you're already losing the conversation.

ROAS is useful, but it's a thermometer, not a treatment plan. It tells you the body's temperature. It doesn't tell you what's wrong, or what to do next.

The numbers that lead the meeting

We open weekly reviews with four numbers, in this order:

1. Contribution margin: what's actually left after COGS, delivery, returns, and merchant fees.
2. Allowable CAC: the most we can pay for a customer and still hit margin targets at the planned LTV.
3. MER (Marketing Efficiency Ratio): total revenue ÷ total marketing spend. The blended truth.
4. Payback window: how long does it take a customer to repay their acquisition cost?

ROAS shows up after that, channel by channel, as a diagnostic. It tells us where to investigate, not what to do.

A worked example

Two campaigns, same week:

• Campaign A: ROAS 3.2, looks great.
• Campaign B: ROAS 2.1, looks weak.

Now look at the rest of the picture:

• Campaign A acquires a customer with a 4-week payback and average reorder rate of 18%.
• Campaign B acquires a customer with a 2-week payback and average reorder rate of 41%.

Which campaign do you want more of?

Campaign B, by a mile, if your cash position will let you fund the difference between today's revenue and tomorrow's repeat. That's a conversation about pacing and cash flow, not a conversation about ROAS.

What changes when you lead with margin

• Creative testing becomes purposeful. You're not chasing the highest ROAS hook; you're chasing the hook that brings in the best-fit customer.
• Pacing becomes a real lever. You're allowed to spend more on a lower-ROAS campaign if it's bringing better cohorts.
• Reporting ends with a decision, not a screenshot. "What are we changing on Monday?" is the only question that matters.

The one-line version

ROAS tells you the temperature. Margin tells you whether to keep building.

Lead with margin. ROAS will be there when you need to investigate.