How fanbox gets lot of money

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hi friends i have question that how fanbox gets lots of money pays to users i dont know it is legit or but i saw some payment proofs. But how the fanbox gets money i have not seen any google ads or any net work ads on their site. I thnk the money which they got is they invest in some stock trading i mean in stock market or they invest in differnt business. I mean how the fanbox gets more money pays to its users. Any of you fanbox member earned many dollars..? plz reveal here.....