I did Amway a long time ago; if you're a certain personality type, the system works very well. I was in for a relatively short period of time and was already a "direct" (six or more wide) and I was several deep. I was making money and getting quality merchandise at great rates; I still miss their laundry detergent.
I left Amway because aspects of their business model made my skin crawl. They sell the dream, but leave out the fact that less than 1% of people have the strength of will to work the system as hard as it takes. Hearing "no" fifty times for every "yes" is very difficult and very few people have the tenacity to stick with it.
I went to a big conference where a speaker spent an hour telling a room full of new people about how great a time it was to get in because they were starting on the internet, and how it would represent exponential growth. It was going to be a golden age. After the conference, I was invited to a meeting with the speaker, and it was only for directs and above. In that meeting he told us that growth was basically going to be the same as always and we shouldn't get discouraged, but use the "internet is instant growth" angle on new people. On the drive home after that meeting I told my supplier I was done and he could have my people.
Although I was pretty successful, I never, ever told people it was easy. I told them that it was hard work but it could be very profitable if they stuck with it, and even if they couldn't put that much time into it, they could still get the product at good rates. It went well for me because people trusted me, and they trusted me because I never lied to them. I was also very relaxed in my approach to people. I was never nervous, I never worried about getting the recruit, and always left it to them to ask questions, so there was absolutely no pressure.
I imagine I could have done quite well if I'd stuck with it, but the lies my suppliers were telling on a regular basis were too much for me. The idea of selling someone a dream they almost certainly were not going to achieve made me physically ill.