> On a more practical level, I can't remember a time my credit card has been refused for local or international transactions (and any additional fees are largely invisible to me, the consumer). Paying with a credit card also carries certain advantages: If the goods aren't delivered, I spend 2 minutes on the phone and get my money back.

I donated to wikileaks. Except I didn't, because the US put pressure on VISA+MC, and reversed my transaction. That whole business convinced me of the need for decentralised currency.