I have also been buying & selling on ebay for 15 years and last month had my first proper scam.
Not sold anything for a while as you hear so much scammer going on, and I also can't be bothered with all the grief for a couple of pounds profit.
I bought a 2020 silver proof, the pictures were just copied from the RM, but I thought as it's a new coin there wouldn't be any problems.
The coin was too cheap and I should have known better, but I bought it anyway.
When it arrived it looked like somebody had made a very bad attempt at cleaning it, so I started a return as not described thinking the seller may not have realised the coin was marked.
He replied that was not the coin he had sent me and I was a scammer, thankfully I have been on ebay for a long time and have got a lot of all positive feed back, where he had only been a member for a year or so. So ebay found in my favour, but it was a lot of grief waiting for them to sort it out.
So no more buying from people with small feedback and have not been member for a long time.
Rather takes the fun out of trying to get a bargain, so I will not be buying much if any from now on.