CAC is the only number that can look healthier while the business gets sicker.

I’ve sat in too many reviews where CAC is down, everyone relaxes, and then three weeks later we’re back arguing about why revenue didn’t move and sales “can’t close these leads”.

Nothing mystical happened. The funnel just got gamed.

If you optimise hard enough for CAC, you end up buying the cheapest possible attention. Low intent, low commitment, high volume. Your spreadsheet looks lean. Your pipeline turns into sludge.

And the real comedy is that “lead quality” is often code for “we’re not showing up”. Response time drifts from minutes to hours, then everyone acts shocked when the prospect has moved on. We do one polite attempt, maybe two, and call it a process. Meanwhile the winners are making multiple touches across channels in the first day and treating follow up like it’s part of the product, not an admin task.

So yes, the leads went cold. Because we left them outside overnight.

Budgets aren’t getting any more forgiving either. Gartner’s 2025 CMO spend survey has marketing budgets flatlined at 7.7% of revenue. 
You don’t get to “scale your way out” of a broken funnel anymore. You just scale the damage.

The fix is unsexy. Tie acquisition to downstream economics. Source level conversion to revenue. Speed to lead. Contact rate. Close rate. Gross profit. Payback.

If CAC looks amazing but the business feels worse, believe the business.