I have also seen people make separate accounts from their real one, and drive the price of bids up.
I certainly hope you aren't insinuating this is something the merchant you singled out in the original post has done, because that particular seller is one of the most reputable, honest and genuine suppliers in the hobby. You wouldn't want to suggest he's doing anything as dishonest and underhanded as that, would you?? Because that sounds like what you're implying.