Q: Why would you sell on Bitstamp when Mt. Gox is 10% higher, and has just moved up 5% without Bitstamp moving?
A:
1. You don't really like money all that much
2. Once a bear, always a bear
3. Manipulation
4. Retardation
Why would you sell at Mt. Gox, at any price, when withdraws do not work?
1. you're delusional
2. you're stupid
3. you like to have a fake balance that you can't really use
4. you are a gambler (and hope your withdrawal will go through)
(hint: there are better places to gamble, with a much smaller house edge)