Since NAND flash is being price fixed, and likely will be for several more years to come (we're just now starting to see LCD prices drop to reasonable levels after years and years of price fixing, I expect it'll take a similar amount of time for the NAND fixing to get busted and the market to respond), I don't think a 10% premium will be at all possible for a very long time. NAND storage SHOULD be significantly cheaper than rotational storage since it is cheaper to produce, requires fewer exotic materials, has a far wider market, etc. And eventually it will be. But for now, there is a huge premium on NAND storage. I am sure Amazon, EMC, and the others have done the math and simply don't think there is a significant market of people willing to pay for such a service, at least not at the steep rates they would have to charge to meet their growth projections.