Isn't bitcoin built because it's easy to make transactions? Why withdrawal can be done only through mtgox redeemable codes in US dollars?
Of course, it's easier to withdraw in BTC. But it isn't too difficult to redeem in Mt. Gox and buy Bitcoins as well.
I'll try to see if BTC withdrawal is useful. But by any means, Bitcoinica is designed for trading (both investing and speculating), and the accounting currency is always USD. This makes margin trading, short selling and all kinds of complex orders possible.
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