I'm afraid that could be seen as almost a sort of anti-popularity contest. I have a better idea;

Those who didn't really want to be in the Psycho game (signed up for Resident Evil instead, or Valentine's Day, but NOT Psycho, or otherwise cannot COMMIT to the game) should voluntarily drop out.

Players can be in, and be in for the entire game, and be in because they want to be in Psycho Mafia, or I'd request that they sit this one out so the more eager players can get in.

I didn't imagine a fight over slots. I hope I get this much enthusiasm when my larger games arrive.