A couple of bad experiences I've had selling retro gaming items to ass-heads on eBay.
cemeterianofsouls - Guiseppe Matuga
oneloanshark1 - Joseph Matuga
Both are from Deer Park, IL, and I've got a pretty good suspicion that they're the same person. I sold two expensive press item prop weapons to oneloankshark1 (a viking axe from "Rune" and a set of prop baretta pistol lighters from "John Woo's Stranglehold.") He didn't pay up. I had a look through his feedback. As you know, sellers can't leave a negative rating for buyers, but they can leave a positive rating and a negative review. A couple of his reviews warn that he's a scam artist who buys expensive items, leaves them at the post office when they arrive, then tries to double his money by claiming an unshipped item to both eBay/PayPal and his credit card provider. I opened up an unpaid item case.
A few months later, cemetarianofsouls wins a $404 auction on a promotional leather jacket from "Red Baron II." I ship it, and a month later I get a reply from him demanding a refund. Seems he's trying to pull a scheme like the one above. Tracking reveals that the package sat in his local post office for almost a month, uncollected. It was shipped back to me, and PayPal gave him a refund. Later he writes to me, simply saying "full refund requested at once." Clearly, Mr. Matuga is not the brightest bulb on the Christmas tree, and one of the more inept wannabe-criminals on eBay, but he should be avoided at all costs.
One other one - goes by brody_steve. Bought "Spawn: The Video Game" for SNES from me for $125, and hasn't paid. He's got one piece of feedback that says he also bought something and didn't pay. He is a troll, avoid him.