One of the false positive feedbacks from "more than a year ago" said '50 negative reports in the last 300'. That's certainly one serial pest! It also shows how many sellers don't have blocks in place because that buyer has had over 2,000 transactions in the last 12 months.
I would now have to assume that the OP doesn't have blocks. That's fine, a lot of people don't know about them. Click on this link, http://offer.ebay.com.au/ws/eBayISAPI.dll?BuyerBlockPreferences
Set the non payment one to 2 in 12 months
Tick buyers in locations I don't post to
Set the policy violations to 4 in 6 months
Next 2 are optional.
Tick block buyers who haven't gone through phone verification and set it to a feedback score of less than 5 (that usually weeds out most scammers as they don't verify their account).
Apply above settings to current and future listings.
Tick the box to prevent blocked buyers from contacting you
Submit.
You can then see who has been blocked from buying by clicking on the Account tab in My Ebay, then select site preferences. Expand the buyer requirement section and at the bottom of that box is a link to Buyer Requirements Activity Log. That link is where you will see who hasn't been able to get past your blocks and can be a real eye opener when you see how many can appear there.
