Processor is always a harder to produce part and there is only handful of suppliers. Not true in case of screens, batteries, may be also memory.<p>Why they choose their own product instead anyother? May be its better, at just 1Ghz 10" interface is super fluid. 10 hours of video on single charge. And owning supply chain doesn't only mean more profit. Now they control features and tweak chips to their own needs much more easily.