Now that the download offer has expired USA Today has written an article about it.
http://www.usatoday.com/life/books/n...ownloads_N.htm
Quote from author:
"Does he fear he'll lose money if they read it free? "If someone wants to try to read all 432 pages online, I'd say 'Good job,' but I figure they'd want a copy of the book at some point."
As for printing it out, "it'd probably take a ream of paper and a whole printer cartridge."
Guess ebook readers never crossed his mind.