> My 2 cents; e-book.
I've thought about it.
Of course the core issue is that, for 2 cents, the Author would rather go fishing than write. While some authors do work for free (or in hope), most want some payment for their time. Which may be very considerable to write a book. (Pictures take even more time.)
Copy-protection is an issue. The Kindle encryption scheme is commercially secure; but anybody who bothers to crack the book can distribute free copies globally. Sales (author payments) go to near zero. Yes, you can scan a paper-book (even perfect-bound) and there's folks in India who do that a lot; but chance of that is lower.
Displaying a book on "any" device, particularly small devices, has problems. Running text usually line-breaks and page-breaks acceptably well. Books with pictures can be bad or horrible. I have several in my Kindle. One was so unreadable (partial images, images too large or small to read, and text chunking) that they recalled it for another copy which was not a lot better. Good tube-amp books NEED pictures (Kuehnel's got em) NEXT to the text. This is hard for some authors/editors to do on paper, and about impossible if the content has to be re-sized to fit "all" screens. It is NOT that easy to flick back and forth, or re-size images, in an ebook.
It could be better when I was younger (and graphical computers did not exist). When young I could focus very near and small (far, not so good). With a hi-res screen I could probably put 8x10 pages on a 4-inch cellphone and read them. Today--- where's my specs? Where's my stronger specs? Even so, I think the algorithms to re-layout mixed text and images are all primitive (compared to important computations like tracking your FaceBook relationships and how ad-buyers could benefit).
Yes, Kindle exists for PC and I can put pretty good size pages on my 23" LCD. Had to do that for a couple years before my eyes were fixed. But being glued to the PC is not optimum for all books.