Well, our boy just won a 9K card.
http://www.ebay.com/itm/1961-Fleer-F...19.m1438.l2649
And a 7k card.
http://www.ebay.com/bfl/viewbids/401...565&rmvSB=true
And possibly others I don't feel like searching for.
Honestly I doubt I would ban him either especially if I had reassurances he wouldn't keep doing it, but then again I wouldn't say that I had if I hadn't, nor would I make a big deal out of a blocked bidder policy if I didn't really have one.