Addendum to other's posts: Published work that entertains people is not the most informative, correct, or even truthful. You see this phenomenon on YouTube with finance "influencers". They'll peddle all these wild investments, crypto scams, and personal seminars to make money. Don't confuse popular entertainment with information.

The sad reality is that a Get Rich title with the words "Make more, spend less, invest the difference" would be one boring, mostly empty page. A Gain Weight book would have no market and a "Lose Weight" book would be "Calories in, calories out, take care of eating disorders."