Lack of creativity probably. I'm assuming most of them see a pasta they enjoy and decide to do a remake, altering it to be about themselves, their OCs, or in the case of lost episode and video game pastas, their favorite shows and games.
PrimeTF wrote: So what that sounds like to me is that people take a story and make it a self-insert. That sounds kinda narcissistic
If you think that is narcissistic, you should see how they react when said stories get deleted. They'll actually send messages to the admins cursing them out and act like they're too good for this site.