Spent the last few weeks digging through ad accounts for a handful of 7-figure DTC brands, and the pattern is always the same: everyone obsesses over ROAS and CPA, but almost nobody tracks new-customer payback period by channel.

Here's why it matters — if you're spending $30 to acquire a customer on Meta and $45 on TikTok, but the TikTok customer has a 40% higher LTV in the first 90 days, TikTok is actually the better channel even though the surface-level CPA looks worse.

Most brands kill the "expensive" channel before the cohort has time to mature. Then they wonder why growth stalls after they've "optimized" spend down to the cheapest CPA.

Quick gut-check if you're running ads for a brand right now:

• Are you comparing channels on Day-0 CPA, or on 30/60/90-day payback?

• Do you know your repeat purchase rate by acquisition channel, not just blended?

• If you paused your "expensive" channel tomorrow, would you actually know if it hurt LTV 2 months from now?

If you don't have clean answers to these, that's usually where 20-30% of wasted spend is hiding — not in the ad creative.

Breaking down brand ad accounts and growth plays like this every week — happy to dig into specifics if anyone wants a channel/cohort breakdown for their own brand.