I've unfortunately got a lot of time on my hands, so I sometimes like to look through reviews that don't look right. Check out the positive reviews and see what you think.
And check out the "Manliness and conservatism" discussion in this product's forum. Do people actually talk like that, and do people on Amazon actually care that much about the concept of manliness to try to have a frank, political, yet civil discussion about manliness?
Here's another book I came across that seems to use this marketing tactic to get a bunch of unrealistic 5 star reviews: Guerrilla Marketing for Job Hunters 2.0. See the similarities?
While I can't prove for sure that the authors employed a guerilla tactic to fake a bunch of fake positive reviews, whenever I see products with unrealistically high ratings, I start to question Amazon's review methods.
I hope the authors can chime in some time on this matter.