I personally think nvidia gets greedy with their prices, rumor has it the next nexus 7 won't use a tegra setup. This I think is also why Sony went a different direction with PS4. They must like to burn bridges I know they did with MS.
Is that why the Microsoft's Zune HD had a Tegra chip in it and last year at CES when they launched Windows 8 RT they demonstrated it on a Tegra 3 tablet?