Penalizing someone for withdrawing instead of starting the dungeon/match, would be pretty messed up. What if joe shmo one day queued for frontline, and before it pops, he gets a call that something has happened to a family member. He clicks withdraw to finish the phone call because he does not wish to hold people up. Then he finds that things are alright 10 minutes later, and wants to requeue. I don't think in this instance, joe shmo should be penalized. Real life happens, and minds can change in an instant. What's worse. Commence/witchdraw box popping up multiple times, or getting into the instance and have half the group suddenly disappear?