pats, it has been 5 or 6 years now since Seller could leave a neg. and that (what is to stop him/her giving me a negative just to be nasty and vengeful)  is exactly why it was stopped.

open / close your non payer dispute

go to your my eBay Selling page, from the Account Tab select  Site Preferences > Buyer Requirements

and block bidders who do not meet your requirements, including x number of Non Payer Strikes in 12mnths.

that'll stop a lot of the time wasters.