I guess I just don't consider a relationship between a GM and a roleplayer to be a business agreement. Obviously, a GM has the final say on whether or not a player can participate, but I never base my decision off of the sheet alone. I often accept sheets I don't love just because I'm curious where that particular character will take a story. If I like the roleplayer's personality, and I see that we can become friends outside of the roleplay, I'd accept them over a perfect sheet but (what I consider) disagreeable roleplayer. A sheet will by no means be a deal breaker. Anyway, I can get a feel for a person's character by talking to him or her, or reading over past posts. I don't feel it necessary to turn them down to test their character, or make them jump through hoops to prove that they are willing to work with me.