You guys are thinking about this account and that account.
I am thinking of the entire economy in general. If they took 1BTC from this guy, 6BTC from that guy and 300BTC from that guy, etc. This all will add up in the big picture. Get it?
But they didn't. They took $1000 worth of BTC from one guy. And even MtGox said it wasn't much, and they will easily cover the loss for the guy who was hacked.