When an author puts their book in the Kindle store only, it says that they want to have their book in the store that has the undisputed largest ebook customer base, and don't want to have to keep track of multiple output vendors like B&N, Smashwords, Sony, Kobo, Overdrive, etc, etc... the path of least resistance. That's all.
I can understand that desire, and wouldn't hold it against an author if they did that... it's their choice. If I decide I don't want the book in that format... that's my choice.
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