I guesss I'm more talking about recasts than I am figures like wolverine, though there was that point a couple of years ago when those factory seconds, or Bootlegs started popping up all over ebay, being sold as the real deal.
ALSO, there is a DISTINCT DIFFERENCE between a Knockoff/bootleg, and an unliscensed 3rd party product.
Knockoff/bootleg is a copy of an official piece. either made the same size, or sometimes enlargerred or shrunk ( Igear mini masterpiece prime)
a 3rd party product is something that is completely original, but based on an existing work.
also, Knock off transformers are gneraly listed as "KO Version" in the sellers listing. whither it's on ebay, in a forum post, or on a site that sells them.