[larrys]

"Lots of people have claimed to sell fake currency in these marketplaces"

It's actually possible to print realistic currency as long as it doesn't match (in certain ways) real currency. When I was in the graphics industry we would get memos from the secret service. I don't remember the specifics but one was the size of the bill. IIRC it doesn't have as much to do (as you would think) with an exact copy.

So then the question becomes if you try to sell fake currency that isn't really even the right type of fake it's fraud. Same as if you sell any good online that isn't represented the way you describe it. And goes by the fraud laws.

But here's the thing. Nobody is going to turn you in if you scammed them on buying fake dollar bills.