You're mistaking the point of invite-only though. Most of them aren't there to deter mediocre writing. As long as the characters still fit the basics they expect, then they'll pass. Their main goal is to stop problem players from coming in, or keep the crowd to people who they and their friends know.

I've seen casts where their apps are all pretty solid so I don't know how much quality checking would really avoid a need for a cap. Now, if there's a way for mods to know who would just squat in a game and reject their apps based only on that, that much I'd prefer because often they are bandwagon joiners with big casts so they can have instant cr and keep afloat in the game with minimal to no effort.