I don't buy for a second that there's no scratch resistant screen just because there's no Corning Gorilla Glass 2 (TM). Corning is not the only company that makes scratch-resistant glass, and competitors with less name recognition probably offer scratch-resistant glass at a fraction of the price. So you go with Corning Gorilla Glass 2 for your flagship due to name recognition, and you go with brand X scratch-resistant glass on the mid-range device for 90% the scratch resistance with 50% of the cost.