If you encounter such a opportunity, don't straight away feel that it's a scam, Some website that i have encounter willing to pay their members up to 60% commission fee just by joining them. This means that, if a person buy a product from the company, and that person brought it because of you, you will earn 50% of the whatever amount the product cost. So for example, if the membership cost $50, you can easily earn it back in a small amount of time.