Any one hear about the SFI ?

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Its a kind of Affiliate. Another kind of earn money online. It seems so may people signup for that. I sign up for free to try . one day past , and there are more than 4000 people under me . but if you want to take that profit, you have to be some thing call EA, means you have to buy something yourself or sell something to the other. Is that scam? Anybody know about this?