If the problem is the concern about fake account, then why not price the units at a static price? Use the pricing model that Avalon used for their machines. If that isn't good enough then the potential for sales over time will be eroded by additional competition and diminished returns from increasing difficulty as more ASICs come online. Strike while the iron is hot, make the money and remain competitive in the market. If the prices are out of whack and everything is dragged out with auctions then others will have time to refine products and get them out the door to willing buyers. Simple economics.