I think I have a story to put all of yours to shame, unfortunately.
I am a huge Star Wars fan. To spruce up my cubicle at work, I bought a bunch of miniature Star Wars collectable figures call BustUps. There is a very high demand for some of the more rare versions, and being me, I decided I wanted to grab as many of the limited edition versions as possible.
I found the "Holy Grail" of these collectibles, which was a set of glow in the dark figures with a run of only 500, on eBay. I had already purchased some stuff off of the seller with no problems. However, when they arrived, it was extremely obvious that they were bootlegged. I contacted the seller and kindly informed him that I would like to return them for a refund. He asked "How do you know they are bootlegged?" I told him that it was very common knowledge among collectors that there were a large number of bootlegs put out with a specific "tell", which was Princess Leia pointing her pistol in the wrong direction... the glow in the dark versions did not use the same mold as the regular version, so the bootlegger, unable to get ahold of one of the 500 originals, just used the regular mold (major duh moment on his behalf). He said "No, that can't be right, I got these from a trusted source." So I sent him the link to the manufacturer's website, which, of course, had a picture of a figure that was very different than mine. At this point, all communication from the seller stopped.
After sending probably 20 emails that were not responded to, I lodged a complaint with PayPal. I told them that I was happy with everything else he had sent me, but I was not paying good money for a forgery. This is the point where the guy really screwed up... not only did he blow me off, but he also blew PayPal off and did not respond at all to their questions about the order. Apparently they weren't too happy about this and, instead of just refunding the money for the bootlegs, they refunded THE ENTIRE ORDER (I had bid on a few other things that were combined for shipping). This is not what I had asked them to do, I only wanted to send back the one thing and get a refund. But PayPal told me to keep everything for free.
Well, of course when the seller found this out, he suddenly was able to communicate. Unfortunately, I had done prior business with this jerk, so he went back and left negative feedback on every single transaction (9 in all) saying I was a scammer.
Long story short, he scammed me and got busted for it, but I'm the one who had my feedback screwed. By the time I noticed the negative feedback, it was too late for me to leave feedback... I had left the feedback open for fear of "revenge" feedback.