Do As Seen on TV Business Programs Work?

We have all seen those as seen on TV business programs where they tell you that you can make thousands each day just by going through the program. The problem is that they do not really explain how it is done. That is, you have to pay a fee before you can find all of the secrets. This does not make sense to me at all. If the creators are making that much money, then why would they want to share that with anyone else? I know that if I was making over a million dollars a year, I would not want other people to take away from that.