not sure if it's just paranoia.
For example, today the volume on Bitfinex was 13k BTC, about 700 k USD.
Throughout the day there was a significant price difference between Gox and Bitstamp.
Thus, if Gox trading was allowed, a huge portion of that USD would end up in the Gox trading account of Bitfinex. How would Bitfinex be able to withdraw, say $ 400000 per day from Mt.Gox and transfer them to Bitstamp and their own Bank account?