I got lucky on an Fee Bay scammer.
I listed a broken 10 meter amatuer radio. It was listed as broken, for repair. Guy won it, bid it up to $150. Got it and opened a claim stating that is was not as advertised, he said it was broken.
I fought it, and Fee Bay found on my side, I got to keep the money. He cussed me and left negative feedback. Fee Bay said they could not retract the negative. I told them I was going to close my 10 year acount. Well, I didn't, and researched his transactions and saw he was habitual for leaving bad feedback. They deleted his acocunt for a few months and restored my 100% feedback.
Oh, and by the way, he got so ticked that he crammed the radio in a box and shipped it back to me. So I got $150 plus the broken radio back.