I dont get it. Price at Bitstamp is always like 10+$ more then BTC-E. If you buy from BTC-E and sell on Bitstamp even with the taxes is profitable. Right now the price of BTC is around 620-630 for a long time. Isnt that going to be really profitable if you do this a lot of times doing the same and the same again. Buy from BTC-E sell to Bitstamp, withdraw USD from Bitstamp and Deposit to BTC-E?
Inter-exchange arbitrage is a waste of time and sometimes money 98% of the time. Inter-market arbitrage is where it is at.