I also leave feedback upon receipt of cleared payment. If you have a scammer, on here you contact a mod. eBay you can leave a follow up comment (i.e., "buyer attempted to extort a partial refund"). I see no need to withhold feedback for prompt payers.
PAYING VERY HANDSOMELY FOR THE "O" IN THE 2009 DREW BLEDSOE BY THE LETTER SET. WILL PAY $25 FINDERS FEE IF YOU DIRECT ME TO ONE AND I AM ABLE TO MAKE A DEAL (eBay and COMC listings NOT APPLICABLE/REDEEMABLE)