Because most of his ideas and recommendations don't scale - i.e. if everyone who competed in taekwondo tournaments won by pushing their opponents out of the rin

Because most of his ideas and recommendations don't scale - i.e. if everyone who competed in taekwondo tournaments won by pushing their opponents out of the ring, then they would change the rules to prevent that from happening. Similarly, if everyone launches their own business selling high margin nutritional products, the margins would get squeezed and the business would cease to be profitable (thereby forcing nutritional supplement providers to find new businesses, like self help books.) Encouraging large volumes of people to buy books with ideas which don't scale is pretty selfish, because with each additional book sale, while you make money, the value of the ideas contained in the book become less valuable. Lots of business self help books are pyramid like in that sense...