I'm a librarian who loves anime, manga, and reading a wide variety of genres.
I hate hearing about an interesting sounding e-book, only to discover that the author has chosen to sell it on Amazon and nowhere else. That pretty much guarantees I'm not going to buy it, because everything else in my wishlist that I can buy at one of my preferred online bookstores (All Romance Ebooks/Omnilit, Smashwords, Kobo) suddenly becomes more attractive.
(Sorry, I needed to whine a little. I'm just a grumpy and lazy reader of EPUB files.)