I never had the specifics, but what exactly was that particular Ponzi scheme?
Total pyramid scheme. Try to suck you in by making you think it is easy to me money and that they have revolutionary products.
http://www.cracked.com/personal-experiences-1620-amway-5-realities-multi-billion-dollar-scam.html
Amway: 5 Realities Of The Multi-Billion-Dollar Scam