Ultimately, it isn't the miners' fault that the 290 and 290X cards are now ludicrously inflated. The MSRP of the 290 is still $399, AMD has not changed that, so there is only the middleman to blame, the retailers. Newegg is only charging that much money for a $399 card BECAUSE THEY CAN, and people will still buy them at that price. The theory of low supply and high demand is complete rubbish, because the 290 has been out long enough now to build up in supply, and yet prices are still inflated. This will seriously hurt AMD in the long run, because the target consumers of the 290 and 290X, the gamers, are now choosing Nvidia over AMD. It will not end well for AMD, even if mining ends suddenly. The market will be flooded with used 290 and 290X cards, and in turn will hurt retail sales.