Ive been a part of a few MLM schemes. And havent been successful with any of them.
However, I can say, those that I was a part of ended up being sued in huge class action lawsuits. Needless to say, I didn't participate in any of them and wished retain my rights.
@sreepyeldarb yeah this industry is ripe for deceit and corruption at the highest levels. The way that some of these companies operate would not be tolerated if a lot of them were public companies. Nowadays it doesn't take much to start your own program and what all of the resources available sadly anyone can open up shop!