It's been a few years since I looked into the world of Ebooks, but in general outline the problems likely haven't changed; eReaders are shockingly niche products, which don't sell very well. This is partially because they last a long time (not for eReaders the 2-year obsolescence typical of smartphones), and partially because so few people really read. PDF's have meant that unscrupulous users can get the ebooks themselves for free, making the whole enterprise awfully unprofitable. The upshot is…
I might also observe that when I do read customer reviews for books on Amazon, it seems there's always someone complaining about their ebook being badly formatted or otherwise unreadable. All that being said, I do have a kindle paperwhite packed away in a closet somewhere.