If you had an amunt that would hurt if you lost it, and enough to do damage later, and had 4-5 guys in in front of you for more than you have in front of you (in a crazy) game, I would fold in a heart beat. Someone either has you beat already, or has AK along with a couple guys having suited connectors, at that point you are not a favorite for sure, and if they are playing crazy like that, then yes I would fold. Getting 4 or 5 to 1 on your money seems the correct play, but not when you get beat up more often than that. Especially if it busts you.
That is the ultimate test. Lay that hand down, then bury them when they pull that after teh flop (when you see it a little cheaper).
I have done it more than a few times. I have even laid down pocket aces. Risk versus reward. if you are a better player, you simply out play them later on.
When you start calling all ins from maniacs you take the skill out of the equation, and make it primarilly about luck. Only heads up are those types of hands really strong, the more players you have, the less valuable they are. Period, end of sentance.
Some people will disagree, but a big difference betwen cash games and tournaments.