Good point about Amazon’s and Apple’s reasons for investing heavily in ebooks. Of course, that was dependent on having a system of Digital Rights Management that would prevent or at least deter readers from copying ebooks freely. It was probably the fear that they couldn’t build or buy reliable DRM that prevented the traditional publishers from jumping in, and allowed Amazon to steal a march on them.
Interesting that you read only nonfiction in ebook format. The usual line is that ebooks are OK for fiction, which is less likely to have charts or tables, footnotes, sidebars and other complex layouts. I must say, I’m more likely to read fiction than nonfiction as an ebook, though I’d rather not if I can get a physical copy of the book.