How is that even possible?
All money amount in mtgox accounts came from:
1) direct deposits.
2) sold btc that were bought with a direct deposit, so mtgox took a comission on that.
I think you're wrong. They can be low on btc, but not low on usd, can't they?
No. There are other options:
money from
3) sold btc, which were mined (not bought with money)
4) sold btc, which were bought on other exanges (bitstamp, BTC-E, etc .. ) and trasfered(deposited) to Gox as btc
5) sold btc, which were bought on MtGox but money diposited not by wire trasfers but other option (Okpay for example)
