You don't know the profit margins on those devices. Sometimes stores sell some products at negligible profit to help move other more profitable items. And sometimes they dump stock at cost/loss. We need cost prices, not retail prices. Furthermore, even if right about the price that's additional cost, as we keep saying. If games cost $12-15 more to account for the more expensive medium, it'd work well, but will consumers be willing to pay that? Plus you only save the optical drive. The HDD (or onboard flash) is necessary for OS and downloads and patches and whatnot. So you save an optical drive at $30 ($35 retail price) and add a minimum extra $10 to every game.