I've seen cablemansam's response. The problem is that even though he appears not be be a shill, David has already said that he uses a shill. He just never said that Sam was the shill.

here is a quote from David' post:

At some time during the auction, if the bid amount is far below the value of the chip, it must be protected. We all have friends, customers & family with User-ID's who are willing to place a bid on the chip for us. If you don't, you are taking a big risk listing on eBay. I call this a protect bid. Taking a loss from one high value chip could possibly offset the profit from several other sales.

end of quote

If his friends, customers & family place a bid for "us" then it is a shill.