Sure, and the supposedly-stolen things I'm selling really just fell off the back of a truck.
I would think that sellers having ties to producers would have a harder time arguing they were selling fakes. And if they don't have those ties -- if they're not supporting the people causing the harm -- then their actions are only illegal for the sake of simplifying the prosecution's work. Which means their likely being able to get off at trial is less of an issue.
Can't someone accused of selling child porn claim it's fake just as easily as someone simply accused of possessing it?