i tried to do a little abitrage.. its not even worth if there is 50 USD difference between prices to other exchanges.
My guess is that with the consistent >10$ difference everyone's trying some arbitrage at the moment, hence the exhaustion of the hot wallet! :O
With Gox price higher, people would want BTC to be IN gox, so they can sell high.
But what I don't get is, how are these people getting the USD out?! Since there is almost no way to withdraw USD from Gox.
Oh yeah, good point, wasn't thinking properly. I guess people are just buying BTC and withdrawing it elsewhere, hence the continuing rise in the exchange rate. Arbitrage would then only make sense once USD withdrawal problems are sorted out.