Why don't most Bitcoin exchanges like Mt. Gox accept debit cards? The Mt. Gox FAQ reads:


  Unfortunately we do not accept any credit or debit payment


Why is this so? It seems like the most natural way to buy bitcoin would be to pay for it using money in my bank account. However this very method seems to be avoided almost everywhere.
Main reasons :

1) Bitcoin is anonymous, free and irreversible. Credit and debit card transactions have to be reversible, Paypal transactions are reversible. So such a system would be a gold mine for card thieves, money launderers, scamers, etc. A relatively small website cannot face the risks.

2) If you're dealing with credit cards you have to follow some regulations, pay charges to the card emitter network, etc.