How many of those do you think are legitimate and how many do you think are out to fleece some $ from those who can least afford it and dream of making it rich, yet never succeed? There are plenty of products trying to suck people in. While there are also plenty of legit products trying to help, the Better Business Bureaus and websites like RipOffReport are littered with complaints from those with the false dreams of riches.
The only reason the scams exist is that there are gullible people willing to fall for them. Stop falling for them is the solution.