I can't speak for all categories of books, but here's an actual author's opinion on the matter for text books: http://from-a-to-remzi.blogspot.com/2014/01/the-c

I can't speak for all categories of books, but here's an actual author's opinion on the matter for text books: http://from-a-to-remzi.blogspot.com/2014/01/the-case-for-free-online-books-fobs.html?m=1 http://from-a-to-remzi.blogspot.com/2014/01/the-case-for-fre...