There is no doubt in my mind that Amazon is the top seller of ebooks for a single store. They have HUGE sales in the Kindle and their ebooks, especially since people use their Kindle apps for their phones, tablets, pc, etc... I don't think anybody is really arguing that, I think they mean (and I could be wrong) that if you add up all of the epub books sold compared to the azw files, the results may be different. There is no proof or way to figure this out as far as I know, so it is just a guess.
Why do sales matter? All that matters is what the owner of the reader thinks. For the most part people that choose Kindle love their Kindle, people that choose Sony love their Sony, and people that choose Nook love their Nook...
The way I see it is, if somebody wants library support and likes to shop around for their ebooks, an epub supported device would be best. If somebody wants access to one store with the largest selection and great international support, a Kindle would be best. Then you have all the personal tastes to consider, but at least it give somebody a place to start.
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