How can that possibly work?
WebMoney is difficult (but possible) to reverse, yet they refuse to accept CCs, because of the easy reversibility. How can one possibly give irreversible cash for reversible CC payment? It's an opportunity for fraud with which one can get away!

As for the May Scale, it's a bit dated. I wouldn't single out US dollars, especially now that the US government is two weeks(!) away from technical bankruptcy. E-gold is also a bit over-rated IMHO.

Google is playing a clever game. They are telling buyers that Google will not reverse payments, but nowhere do they specifically say that the credit card issuer will not reverse the charge if the buyer complains. I believe that if buyers don't get their goods and file a chargeback with the card issuer, Google will have to pay. Whether Google goes after the seller is the real question.