It really depend how you value the ecosystem. If every app that you ever use is available in Android and you are happy with the way that Android deal with system integration, then you have no reason to pay any extra for IOS devices. And there is no reason you would wait for Ipad mini retina to start out with. Clearly there are enough customers that value the ecosystem and app availability and willing to pay the extra. Every time I buy a tablet or smartphone, all the free apps come with the purchase and every paid apps is something that I can choose to spend my money late on. e.g. I used bloomberg, CNBC and a local TV station KTVU app extensively and as far as I know there is no Android equivalent. I am pretty set for IOS. It is very much individual choice but the fact that Apple went through extreme length to make sure apps running on IPad has consistent look help. And the fact that Apple user as a group is more willing to spend money help even more that feed the app development cycle.
Don't you agree that the main attraction of Android handset is the low price with similar hardware function? But it was never low price for equivalent software function. Like it or not, someone is willing to pay for all the software and it drive all the Android fans crazy

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So if that is your argument, you should stay in the low end of the mobile device range. Why would it bother you if someone else is willing to pay for the higher resolution?