One of the dumbest things I've ever done in my life was joining this MLM pyramid scheme called 2by2.net. My bro and dad got involved in it and I was suspicious at first, but I figured if they thought it was a good idea, maybe there was something to it. Needless to say, I spent quite a bit of money, convinced one of my friends to join under me and spent a lot of money and all I made was a whopping $60.
Amway is a multilevelmarketing scheme as well and although it's not as insiduous as the other pyramid schemes out there, stay away. With most of them, you have to spend a sh!tload of money and time, try to get your friends and family to join, thus alienating them and then figure out some way to unload tons of product. I had a coworker invite me to an Amway meeting and I declined.
I also had a former sister in law that was down with Mary Kay, another MLM pyramid scheme. She made no money and spent tons of her own money acquiring product (makeup/skin care stuff) and was unable to sell it.
With most of these schemes, the only people who make serious cash are the people who start the company and maybe the few that get down with them right from the beginning. Once the public becomes aware of the scam, which is what they really are, it becomes much more difficult to make any money at any of those schemes.
If you want to keep your money, your time, your sanity and your loved ones, stay the f*ck away from any it's too good to be true multilevel marketing pyramid scheme. If it's too good to be true, it probably is.