Here's one to add to your blocked list: mayer_res8izy
This guy had been buying from me regularly with no problem. Never contacted me with any concerns and the feedback comments always seemed to indicate that he was completely satisfied. He then decided for some unknown reason to systematically destroy my feedback. Maybe to help a competitor, or he has now decided to start selling comics... who knows.
His master plan was to leave positive feedback with low DSRs in rapid succession for 14 items spread out over five transactions. Due to the underhanded way he was manipulating my FB, I had no idea what was going on until I saw my account downgraded from Top Rated to Above Standard and ran a DSR report.
Once I discovered this, I sent him a message thanking him for his business and asking how he liked the books. He responded with a question about splitting up an invoice, but with no acknowledgment of my message.
According to ebay policy, leaving positive FB with low DSRs is feedback abuse and is supposed to be removed. After three calls to customer service, ebay refused to remove the low DSRs since they worship all buyers and treat sellers like garbage. Now my account is downgraded with loss of seller discount rates due to this loser. Make sure to block this guy ASAP.