Yes, do be careful of the shill bidders. And do not bid more than the minimum bid if you are the first bidder. We have done that and the shills bid us up to our maximum bid. How they knew when to stop I can't say but I suspect they are part of GWs organization, or at least have access to their computer systems.
We filed a complaint against one bidder and GW denied any possibility of him being a shill. That just confirmed to me that he was.
Very shortly after that this person quit bidding. Coincidence, I think not.
Joe