Ebay don't need to, they have a perfectly good system in place called an unpaid item dispute for non payers requesting a cancellation... buyer doesn't pay... seller gets fees back

I cannot understand why more sellers aren't using it... 

I know it's a pain waiting the 8 days out, but i'd rather wait than lose my selling fees.. and I get a slight bit of satisfaction that I'm contributing to limiting the regular habits of these tyre kickers