I will be sure to never do business with that guy. I'll tell you about a similar problem in reverse I had that worked out. I sold a very nice L.C. Smith Field grade on Gunbroker a few months ago to a guy (whose name I have regretably forgotten or I would happily publish it). This guy had the winning bid but told me not to bother to even ship the gun as he was not going to send me the money due to a blemish on the barrels that he just couldnt get past. Never mind that I had pictured the blemish and offered a three day inspection period. Since this prick wouldnt even send me a check and complete the transaction, I had to eat the listing and final value fees which totaled around 40 bucks. When I said I was going to list him as a non-paying bidder, he said he would "ding" me as well. Long story short, I felt I would only hurt myself by doing this,so I let it drop, since I didnt have a lot of feedbacks (all were positive) and was trying to build my business.
I sold the gun a week later at a gun show for 100 more than he bid anyway. But he can burn in hell.