Yep. It would be experimenting. Not sure it would work anyway.. but interesting.
However the purpose of showing an average is to set a baseline (or current market price/value) - so others can choose to go below, meet it or above mentally.
It depends likely more on how many zaps are an average per Nostr post in general. If posts only get 3-4, it’s less useful. If it’s a popular only fans style post, lots of zaps and the zaps likely continue over a longer period of time for that single post (or a blog post, other example exist too).