Rolf, you come across as a lifelong skeptic [I have no doubt conscious or otherwise, your philosophy is that of skepticism: perpetual paralysis].
1. You say the book is "over simplistic" - then why are YOU not using it, doing it, and as popular? Could it be that your philosophy is wrong and you are wrong. The book is simple but not simplistic.
2. I do not know many people advice against turning your hobby into a day job. I know many people who advice doing it.
3. Anyone can emulate his success: so it is not naive at all. There are MANY people on the net that are unKNOWN but very wealthy: from those using eBay to those using Google ad-words; to Facebook ad-words; to those using blogging and video-blogging etc. It is your skepticism that prevents you from going forward in life; but worse you portray your warped mental model onto others sabotaging their success.
Now some suggestions for you and readers:
- in a capitalist , democratic nation - you can indeed be, have to do anything you want within reason. It is up to you to get going and keep going. There is no guarantee of over-all success, but in a reasonable time (e.g. 6 months) you can determine if what you are doing is working or now and be able to change approach. In fields where many others are earning then it stands to reason so can you if you model that strategy. In fields where some others are earning, if you have the capital (or live in a nation with social security like the U.K) then you can go on the dole yet find ways to increase your earning. There are always a way for the creative and committed. It is not rocket science.