I think there are only few things left that aren't exploited by fans to cheat their faves into popularity. Like we know mass streaming is a thing, we know that mass organized album buying projects are a thing, we even know buying followers for their faves is a thing. We've come to a very ridiculous point with the fandom wars.
But I've never seen people mass buying stuff like season greetings or lightsticks (unless you're a somnia trying to build your own mongmongie tower ). So I am curious to look at what each groups sales are for these non competitive things.