The same happened to me at 17 and keept it going till I was 19. I really didn't buy that many Amway products, but I did enjoy reading the monthly self help books they sent, many of those books were really helpful.
I mostly enjoyed listening to the stories of those above me (I never made more than $400-500/mo so that was most people who weren't losing money) but of course I paid for those CDs so in the end I made much less money than it looked like I did on paper.
I do like the concept of being positive, visualizing your future, making a plan to reach it, etc. It's a shame it's so closely ingrained with a company selling dish soap and disgusting energy drinks, though!
Fuck, maybe I should stop drinking those? :P