I think people need to realize that you can't trust anything for face value. I'm new to Listia and I reported some middle schooler trying to auction off 2 laptops, and he was using images from Ebay, of all places. I got on the next day and his auctions had been deleted by Listia. So far I have won a $5 Starbucks Giftcard and a coupon for a free tub of Pillsbury Dough (cookie dough, biscuits etc.)
I think people just need to do a bit of research. If it looks like a stock image, you can drop the image into Google image search and it will find any versions of that picture on the internet. I do agree that Listia staff need their customer service skills looked at, but most of this stuff could be handles by people being a bit more cautious with what they bid on. If it looks to good to be true, it probably is!