In fiction, you can sympathize with the main character or hate him, but he is out there somewhere, and you are right there. Business books are very personal - their recommendations relate personally to you, the reader, they concern you here and now, they advise you on what to do tomorrow when you come to work. Or even today if you don't have any patience.
Therefore, when reading business books one can notice that he is full of positive thinking. This is a funny thing about business books. Because of this general attitude, all business bestsellers are so similar to each other. Moreover, business books do not often contain useful information, but they motivate action, which is useful.
Is it possible to write a business book without positivity? Yes, but then it will be something terribly boring, like an analyst's reference book. It will be useful, but there will be no motive for action. You can imagine a business book that would intimidate readers, lower their ego, even though the reader paid their money for it, but it would have to be a very special book, like The Mafia Manager. Positivity is simpler.
PS
But on blogs it’s possible to intimidate, butreadingBlogs don't pay, right?
