Contemplating the idea that Big Successful RPG franchises get that way by providing vehicles that cater to That Guy to be That Guy in-game while providing fictional cover.
Oldschool D&D did it for oldschool nerds; oldschool White Wolf did it for theatre kids; newschool D&D does it for uwu queer kids who scream at strangers on the internet that they're paedophiles if they read fanfic of the wrong characters; Onyx Path does it for crypto-neo-Nazis