I just can't see how that would work.
Hey look!
BTC is $100 more expensive on Gox than on Stamp!
Let's Arbitrage that fucker!
Ok, $100K onto Stamp. We seem to have bid up the price a bit on Stamp has have all the other Arber's but no worry, this is easy money.
Hooray, we have sold for a 10% profit onto Gox!
But wait a minute! We are doing this, dozens of other of arbitragers are doing this, so who on Gox keeps buying the cheap BTC at the Gox premium?
Willy is buying! Hooray!
Ok, lets get our funds out and do it all over again.
Shit, Gox won't give us back our funds, only BTC, what do we do?
"Buy Bitcoin and hold it, it is soaring in value anyway"
"Hooray"
This *1000.