Well, lets put it this way. We know that there are extreme and excite cards out there, because people are buying them (and using them on our site). We list where they got them on the pages so that others can find them... however, we didn't actually know where they were until reported.
I know that some of our cards are in different currencies (Fun Card in Canadian Dollars, Excite Card in British Pounds) because when they get used, they show up with the currency. I do not really know that this is the ONLY currency, I just know that this is what we have seen actually used.