I can see a huge draw for something like this. One of my core use cases for Reddit (and CheapAssGamers among other sites) was tracking video game and related sales. My default sub was a meta-reddit of just sales sites (e.g. r/SwitchDeals, r/gamebundles, r/gamedeals, etc…). Not sure if this lines up with OP’s question (which may be more market / marketplace focused) but there is a value in communities like this, from my humble perspective.