I enjoyed this book, and I think it's going to be useful. It pulls a lot of information into one place, and organises it. It proposes quite a radical shift in an author's mindset from "I write, publisher sells" to "I write, and I think who and what I am writing for and why they'll buy it." The marketing is more important as the writing.
The model of publishing in this book is very much possible because of the internet and the ability to turn easily stored and transmitted digital files into presentable hard copy on an as needed basis, without needing to carry large stock, or take up bookcase shelf in a shop. The demise of a large bookstore chain in UK recently shows some of the problems of shop based, high staff, high stock businesses.
Publ;ishing will change and savvy future authors will be examining their options, which may or may not need large publishing houses. This book gives several useful ideas for authors and is worth reading.