I have never had this happen, but I don't buy from first-time eBay sellers. There are definitely scams on there, but they seem to be "too good to be true" prices with 0 reviews on the seller.

Surely you're not getting scammed by sellers with lots of reputational history?

I actually am more nervous as a seller, as their buyer protection almost always sides with buyers, at least in the US (and the fee is astronomical.)