We followed one beauty account's ads for a quarter. Cost per enquiry did not rise as they aged.
In the one beauty account where we hold ad-level data for a full quarter, cost per enquiry did not deteriorate as ads got older. Fourteen ads that ran unchanged for the whole period held their cost per enquiry inside a band of about 15% either side of the median all quarter, with no upward trend. Eight further ads followed from the day they launched cost about 16% less per enquiry in their seventh week than in their first. Cost per thousand impressions did rise, by about a quarter at its peak, but click-through rose with it, from 1.95% to 2.40%, and the higher click-through offset the rise in CPM.
What we do with it
We do not refresh creative on a calendar. We change an ad when its own cost per enquiry moves, which in this account it did not, and we treat a rising CPM on its own as a reason to look at click-through before concluding anything.
Limitations
One account, one market, one objective, so this is not a statement about beauty advertising. The conversion action is a started conversation, not a booked treatment, so fatigue could show up as worse conversations at the same cost and this measurement would never see it. Meta may also be rotating audiences inside the ad set while the creative stays fixed.
One Hong Kong beauty account, HKD, Meta only · 1 Jun to 1 Sep 2026 · cohorts defined before the outcome was looked at