Never make the mistake of leaving a negative comment with a positive point. A buyer can ask for it to be removed and ebay will report a policy violation against your account. Close the UID just over 4 days after it was opened and the buyer will receive a strike. Anyone with 2 or more strikes can be blocked by sellers. If you haven't done so yet add his ID to the blocked bidders list in Site Map. The link is at the end of the page. If those sellers had arranged strikes for the buyer he might not still be a member.