Amazon's business model is a closed one, and they share this strategy with all the other big players (Kobo, Sony, B&N).
Amazon has gone one step further by using their own proprietary format. To suggest that the decision to use .mobi (and not support .epub) is merely 'historical' and unrelated to proprietorial strategy is ridiculous. Amazon know exactly what they are doing. Sure you can convert with Calibre, but the average user can't do that.
All the big players want to lock users into their store and control the electronic book market. Amazon have just gone one step further to do it.
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