Because the forums are segregated from the main site I have no way to contact players that apply and fail to submit a character. I have no way to tell them I can't let them in until they do or signify that their application is not good enough, and upon delclining I cannot give a reason why. The inability to talk with players applying really makes getting players hard.
If you just OK every application they come in and forget the game is running, where if you can communicate with them a little bit before allowing them in you can root out the players that give the standard "I really want to play your game" then drop out immediately. In the meantime hogging a slot somebody that actually wants to play your game could be inhabiting.