Is it fair to assume the end price of bitfinex = mt gox?

[cost9170]

....Since you can transfer all your coins to mt gox and other sites, do you think this is a fair assumption? I have bitcoins held at bitfinex and the spread b/w mt gox is getting wider (currently bitfinex = 980 and mt gox = 1080). But ultimately even if bitfinex doesn't move up as much as the others, you can just transfer the coins. Am I missing something here?