I sell 200 items a month on eBay. Plenty of scammers out there, but these really are the minority.
I think scammers will target unsuspecting honest sellers who don't know the buyer protection rules properly, particularly with regards to sending items recorded delivery....
Ebay are trying to provide a safe environment for BUYERS not SELLERS, which is ironic as all eBays income from sellers!! In theory it should work, eg if you buy something, and it doesn't arrive then you should get your money back shouldn't you, which is right. It's just unfortunate that scammers will always try to exploit these opportunities......