Is "success stans" really a thing?

also the fandom is bigger so if youre looking for a community succesful groups are best.

The wanting to be on the winning side is a given, also gives you free reign to drag other peoples faves when your faves are at the top. Probably explains why so many trolls take big groups as an aesthetic (in general not just here)

I feel people usually post about things they care about.

Some users I notice only ever post about achievements and numbers so pretty sure that's all some care about.

ignore my title card

They do but you would be surprised with the amount of visual stans in kpop fandom even if many didnt want to admit it themselves