I remember listening to a seminar many years ago by the great speaker Jim Rohn (who passed away this year). He said then that if anyone ever pitches you a multi-level opportunity where the product isn't mentioned as the most important thing then the alarm bells should start ringing.

This is a scheme that goes on about earnings, affiliates and making money with a few lame products tagged on for good measure. Some will make money, but it will undoubtedly fail.