I found it funny when half way through the book I realized what I held in my hands was a product of exactly what was described in the book.

Whether you liked it or not, it sounds like you read it and I'll assume paid for it so that's proof that the theory can work. Even with skeptical people! ;)

Well, I remember that he actually almost explicitly says this in a footnote in the part where he talks about choosing the right kind of product to sell, where selling information is best because the markup can be thousands of percentage points. Nevertheless, although Tim Ferriss absolutely makes a ton of money from his book and speaking gigs, all of the things he describes in the book were accomplished, by definition, before he earned a cent of book royalties.