RPGs are kind of a weird case; they're not "games" in the same sense as a competitive game, because there's not one fixed thing specified in the rules that you're supposed to be maximizing (this is part of why I don't play RPGs :P ). With those you start getting derogatory nicknames for those who don't do everything possible to win (e.g. "scrubs"). Though I don't know of any short term for those who do (aside from just "people who play to win"), except in the context of Magic where they're known as "Spikes". Of course, if we're speaking of "winning at life", there it is also not clear should to be maximized! People aren't very good at knowing their own goals. So that's something of a disanalogy.