on services and upgrades (AAPL refresh producst much faster than other makers).
In this US economy condition, not all users can afford keep doing that. How many Verizon users can afford upgrading to iPhone5 in the next few months if they buy iPhone4 now? What the users bought iPad in Dec 2010 would feel if iPad2 comes out in Mar?
Many of AAPL users bought over priced insurance together with its products. When they upgrades the product, the insurance get wasted. AAPL is acting like Bestbuy sales, extracting every penny out of buyers. AAPL users are being robbed to support AAPL rocket rising stock price. That is not sustainable for long term.