Earlier quoted context omitted.
You believe something about people's behavior which is a testable proposition about the nature of material reality, like "If you push an apple off a table it will accelerate to the nearest cat." The scientific method exists. Have no worries, your apples and profits are both safe, because both those theories are absolutely false .
Interesting that you would mention the scientific method, then offer no evidence for your theory. I said what I did because I have seen it happen countless times in a long career that has included a lot of writing. I have the evidence. When someone makes a performance claim about the contents of a book, the book then becomes nearly irrelevant to the outcome, which hinges on the claim.
As it happens, I have a product launch coming up. I will offer a money back guarantee, and I will do it in an A/B test. If I am wrong, and the guarantee statistically significantly decreases sales, I will a) have a cow and b) donate a cow to charity. If I am right, you don't have to do anything, because being consistently right at this sort of prediction makes propositional bets with authors a distinctly inferior way to increase one's income versus just being consistently right at this sort of thing.