That's less of a scam and more of a personal responsibility problem. Like gambling, it doesn't necessarily involve any dishonesty, just encouraging you to imagine you'll sign up a lot of members or sell a lot of product. Further into the less-scammy direction is you buy a toy for your kid but he doesn't like playing with it. Were you scammed into buying a useless product? In a way, yes, but also there has to be some point where people are allowed the freedom to make their own mistakes.