Because that doesn't take understanding of economics, just a talent for separating people from their money -- and lack of scruple regarding how one does so. It doesn't take a lot of economic theory to understand that having a license to print money is like having a license to print money.... Success at what, though? Other than separating others from their money... There is a difference -- of which you seem to be unaware -- between doing "it" right and doing right, between doing "it" wrong and doing wrong. Some people fight against the reality of systematic, institutionalized injustice, while others are content to "navigate" it, and thus arrange to make themselves its beneficiaries. The latter are what you call, "successful" -- but the former are responsible for all humanity's progress towards civilized society, while the latter have only impeded it. No, because the truth is not congenial to the narrow financial interests of the rich, greedy, privileged parasites who actually own and control everything. That is why economics has never been able to join the ranks of the genuine empirical sciences: that would be too inconvenient to the takers.