Suppose you could buy ads that are active every other week. I feel like after a few months you could compare the active and non-active weeks (perhaps excluding

Suppose you could buy ads that are active every other week. I feel like after a few months you could compare the active and non-active weeks (perhaps excluding holidays) and have a pretty good sense what you are getting for the ad spend. Sure you might have some opportunity cost, but this seems like a sensible strategy for a new company starting out.