There are five generations of Kindle, and I believe I saw every generation in use except for the first. Our business approach is to sell premium hardware at roughly breakeven prices. We want to make money when people use our devices—not when people buy our devices. We think this aligns us better with customers. For example, we don’t need our customers to be on the upgrade treadmill. We can be very happy to see people still using four-year-old Kindles!