Why do people buy popular and fraudulent diet programs?

People have died from taking these "diet" pills and vast variety of "Lose 20 pounds in 3 days!" gimmicks yet they still continue putting out money. All the pill/diet makers have to do is one little thing "Not approved by the FDA". If people would actually read the tiny print on all of these packages it shows nothing is guaranteed, you must still diet and exercise, it can cause death and serious injury, and tons more stuff. People are just too lazy these days. They expect to drop the 80 pounds they gained in a matter of a week doing the cayene pepper mixed with water diet. (i kid you not).