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					Originally Posted by  ApK
					 
				 
				You've never heard of "making it up in volume?"  They make X% less per book but sell 3X% more books because they can now sell to nook, sony and kobo owners...sounds like a good idea to me.  Hopefully Amazon has decided that there are enough of those folks now to make this a good idea. 
			
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 But how much market are they really missing? (Talking US only for the time being)
The Kindle is by far the dominant eInk reader, and they have apps for the iOS/Android tablets, plus BlackBerries and probably a few other things.
At the moment they have a positive feedback loop between device and store, people buy the Kindle because it has access to the Amazon store, then buy Kindle books because it is what their device is built to access. Selling to other devices breaks that loop. So while they might gain some ebook sales, they might also lose some device sales, and would have to balance that.
A question: What is the largest ebook store that sells plain vanilla Adobe Adept DRM books? Amazon don't, B&N don't, Apple don't. They have all (presumably) independently chosen to use their own DRM mechanisms and avoiding paying money to Adobe.