[guessing] Perhaps you need to be in China to open an account there? In That case few people will be in a position to do arbitrage between the Yuan and Dollar. [/guessing]
oh, but if you check https://bitcoinaverage.com/#USD theres a lot of price diff even in us exchanges even if you leave out gox
hi the price on btcchina is at 800$ and at bitstamp its 593$. why dont people just sell at btcchina and buy at bitstamp? is there something im not understanding here?