Does MLM really work?

Yes, it does.

If you are committed and you devote enough time to develop your "business" to make it successful, MLM CAN and probably WILL make you a millionaire.  MLM is probably the easiest and fastest way to make a lot of money when you are successful (unless you win the lottery or you are a professional athlete of course!).

Network Marketing - Multi Level Marketing - Parameters posted by the FTC

Here are parameters posted by the FTC (Federal Trade Commission):