Generaly from what iv seen there are more negatives and its pretty dodgy iv got some info for you though.
Criticism of MLM
The Federal Trade Commission (FTC) issued a decision, In re. Amway Corp. in 1979, which indicated that multi-level marketing was not illegal per se. However, Amway was found guilty of price fixing (by requiring “independent” distributors to sell at the low price) and making exaggerated income claims.
The FTC advises that multi-level marketing organizations with greater incentives for recruitment than product sales are to be viewed skeptically. In April 2006, it proposed a Business Opportunity Rule intended to require all sellers of business opportunities—including MLMs—to provide enough information to enable prospective buyers to make an informed decision about their probability of earning money. FTC trade regulation rules usually take 1-1/2 to 3 years before a final rule is established.
Criticisms have been raised against MLM programs for being cult-like in nature. Many MLM programs feature intense motivational programs, which can be hard to distinguish from cult propaganda. Criticism of Amway as a cult have been regarded as largely baseless, though some of the “Independent Business Organizations” within Amway have been accused of operating as cults.
Another criticism is that MLM programs are set up to make most distributors fail, as there is an incentive to continue to recruit distributors even as the products have reached market saturation, thus causing the average earnings per distributor to continue to fall
