If the book encourages or explains how to do things that are against the user agreement or game rules or whatever, then I hope the kid gets crushed. If not I hope blizzard loses.
Either way the book is a scam.
It is not a scam.
Sure most if not all the information in this "book" are avaible free online.
But did you ever think not everyone wants to alt-tab to their browser or even a text file to look up something while they are playing WoW? Did you ever consider some of us would like to have it all in printed form complete with an index and such for quick listing? No need to alt tab or anything else.
Sure you yourself can even print it out, but not everyone has a printer, OR wants to waste a ton of paper/ink to print out the massive information that WoW contains. The book is a reasonable price considering production cost, it would be cheaper to buy it. Not to mention some people, like myself, would rather pay a few bucks and save myself hours apon hours of watching my printer clunk out 50+ (and thats a small estimate) pages of WoW information.
The only thing the guy has to worry about is if his guide, as you mention, is if he discusses exploits or cheats. I doubt he does so under DMCA and the First Amendment he is well within his rights to write this book and sell it.