I think it would be perfectly logical to impliment some sort of system for keeping track of quitters, but I hope you'll all bear in mind that quitting isn't always a disrespective course of action. I quit 4somes and 3somes all the time, not because I'm losing, but because I discover that my playing partners are children, who take two minutes for each shot and just horse around. Admittedly, it's sometimes annoying when people leave your game and you have to wait 5 minutes to resume, but it's important to remember that any number of real life circumstances could be responsible.