I think the bidders just thought they had a chance at a great bargain
Or maybe they're thinking they can resell it without stating that it's a reproduction and make a nice profit. I really can't see spending this much on a reproduction. With today's
home printers, you could make one yourself for a lot less, so what would be your motivation for buying it, especially for $401?
They could probably send it to PSA and those clowns would give it a gem mint 10, and once it's slabbed it would become even more difficult to prove it was fake. However, the buyer has a high feedback rating, so s/he could have a lot to lose by reselling a fake if the new buyer complained.