If all sellers had non payer blocks in place, it would stop these pests in their tracks. Sadly, I believe only a small percentage of sellers have them. A lot don't know about blocks and others choose not to have them (for their own reasons). I believe the blocks should be in place by default and if you don't want them, you can opt out. Would save so many dramas. Might make non payers more accountable too. Trouble is, eBay would lose too much in unclaimed fees.