It focuses on newspapers but it's relevant to e-books too and emphasizes one thing that is rarely mentioned.
To read e-books (e-papers) you need lots of things that cost money (pc, broadband, memory storage, devices...) that you do not need for regular books or newspapers, so that's a main reason people are not going to pay a lot for that content. Here:
http://blog.publish2.com/2007/09/21/...omics-of-news/