And take what action? Require that they submit photos of item? How hard is that going to be to find online and how fast will the complaints file up? I understand where your coming from, there's just no way to enforce the "i think thats too good so I'm going to report you" rule. I have bought stuff on ebay for pennys on the dollar many times. When I lost my job years ago I made a living buying and reselling and I would spend hours a day looking for deals like this. Sometimes they were scams. Sometimes they were legit deals.
Someone hoping for a good deal and well protected from fraud is not stupid in my book. Naive, maybe. They were protected with almost nothing to lose and a helluva a deal if it wern't a scam. Worse case scenerio they wait a couple weeks from time of purchase and get their money back. Considering the payoff I'd say it's not bad. Try to get the same deal in a casino.