The scam I got hit with on eBay the other day that sent my blood boiling was the "returned as defective" scam.
Basically any buyer can claim an item is defective, without any proof, and send it back to you for a full refund.
I sold a HasLab Yakface to a comic shop guy. My auctions are always "as is / no returns". He got his figure and gave me positive feedback. A month later the market rate for this item dropped and he wanted to return it. I said no and he reported it as defective. I offered him a few bucks back but still said no. eBay intervened and told me that they were taking the money out of my account and that I had to pay to have the item shipped back to me. I told the eBay person that I had photos that proved it was in immaculate condition and that the buyer had provided positive feedback.
Ultimately I had absolutely zero defense and took the item back. I got screwed out of the sale, got the item back, but still had to pay PayPal fees, shipping fees, etc. I get it that eBay needs to protect buyers, but this left me as a seller with zero options. I miss the days of common sense and little oversight from eBay. You looked at someone's rating before buying and if it had bad feedback you moved on.
I'm not sure what I'm going to do with some of my higher priced items that I want to sell. I'm not sure if I just got a jerk or if this is going to be the norm where I could be out $50-$400 depending on what level of a-hole I'm dealing with. I've sold hundreds of things on eBay with only minor hassles until now, but this transaction scared the crap out of me.