I have frequently thought: What if a book only has 10,000 readers, or 5,000, or even just 1,000 readers who alone in the world want/need that particular book? Who will publish it? No traditional publisher would touch it. And that is why, to that particular author, Amazon is needed and Hachette is not.
Very interesting article I just came across about this conflict:
http://techcrunch.com/2014/08/30/few...8TechCrunch%29