Ok, I am pretty sure that you get penalties for leaving, not positive though. If you do get pennalized for it though, I think that is lame. One time I had to go to pull a #2, and i couldn't cuz i didn't want my score to drop. Eh, if there isn't a score penalty for leaving, then i should just use the bathroom, but if there is, it shouldn't be there.

But then nobody would ever win a game, because everytime a player was about to win, the opponent would leave.

then maybe a fomula, like, if only 2 of your balls/opponents balls are left, then you must stay and finish or you lose definately. If you leave with more then 2 balls left, then you lose half, but the opponant still gets full win.