Critics of PMA argue that it is not the secret to success but a by-product of success. The "self-help" industry has been criticized as a scam for authors to make money due to its simplistic writing and principles. There is little evidence, however, that self-help books, life coaching, and motivational speaking are harmful; a study of 100 psychotherapy patients found that of the 43 patients reading books (e.g. PMA, religious texts, Alcoholics Anonymous texts, etc.) 4 reported "mild harm or distress" while 34 reported "benefit without harm".