Under Karpeles, Mt. Gox evolved into a reliable marketplace for buying and selling bitcoins, now the world’s most popular digital currency. By one estimate, Karpeles has made over $8 million plus 345,000 bitcoins (at current rates: $86 million) swapping bitcoins for dollars and yen and other federal currencies. But much like McCaleb, he’s a hacker rather than a businessman. He seems more at home talking about IRC than the IMF, and as Mt. Gox has grown, he and his company have found it difficult to deal with the realities of the financial world.