I never really regretted it because there were so many other bad things I could be getting into at 16. Especially where I lived. It also instilled some values that I still hold today.
Not to mention that at 16 I had access to wealthy people who taught me how to manage my money.
So yea, Amyway is a trap - but a lot of people are happy in that trap. I think the most disappointing thing for me was when I realized that the guys at the top aren't getting rich from Amyway, they were getting rich from everyone buying tapes, books, and going to these conferences.
Edit: Typing is hard