Counterfeit Carts

Curmudgeon Gamer has an interesting post about the sale of counterfeit cartridge games at stores selling used games.

Bottom line: It may happen more frequently than people know. It appears to primarily be people buying them off the web (ebay, etc), and selling them to used-game stores afterward. The staff seem to be uneducated on the subject, but is management? And should they be responsible for counterfeit merchandise in the same way pawn shops are?

I wonder about how many counterfeit PS2 CD games there are in stores?