If his cousin was winning the auctions, than that's not illegal. Only if he's bidding and driving up the price for every auction...
If it smells like...
I looked at 24 past items that had comments from buyers from discmanbob (just teh first tab), 16 of them had bids from kirby. Kirby NEVER won any of those auctions, and many of the bids were dated later than the actual high bid (i.e "bidding up"). The fact that ALL kirby's feedback is from unclebob shows it's a scam - he has to leave feedback to fake that the sale went through in teh event that he screwed up and actually became the high bidder. Plus all teh feedback is generic, vague, and similar. I'd bet if you looked into it, you'd see many of the items back up for bid. Despite the fact that anyone may know him to be on teh level - he's scamming you, plain and simple. Look at anything you won from him, chances are "kirby" bid it up at one point. And even if you weren't scammed, just look at any past listing from unclebob and see if kirby bid but did not win. I doubt kirby is such a horrible ebayer and bidder that he only wins unclebob auctions, and loses so many too.
Thanks for the heads up, I won't buy from him.