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From a hardware perspective those with a kindle are going to be less likely to get a new one any time soon. With that in mind it would make sense to update some of the prior ones since that's the customer base. Those that own kindles are more likely to buy kindle books (obviously) than those that use the kindle for pc/mac etc platforms.
In other words you tend to not tick off your user base. Although I am not sure as to how long that should be it should not be that hard to support things for a few years. We aren't talking five years here I'd say a few.
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