How Good are the health products sold on MLM

Of late we see so many companies offering lot many products for weight management, increase six packs, which are PRICED at anywhere between US $ 500/= to 1500/= and above for certain kits. How many of you are into it and got the results in terms of health and NOT AS A MONEY MAKING PROPOSAL Your views will help other net workers to get into the wrong companies and loose money.