I don't see how you can hold a person responsible for the potentially fraudelaunt/illegal activities of someone else.
By this logic, no one should ever sell a car in case the buyer gets drunk and drives it into a school bus.
I do agree that the seller is acting irresponsibly to the hobby, and is probably going to get in trouble with PSA for copyright issues, but if he wants to take that risk, he is free to be as dumb as he wants to be.
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