bninvestmentbux..i dont quite get it?

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I'm a member on this site for about 2 months and I have around $7 in my account and I requested my payment 3 times already and always I got my balance returned to my main balance and a message from admin saying something about being paid % you invest, so I dont understand it..if I buy referrals for $5 how much will I get paid from my actual balance? is this site investment only, the more you invest the more youre paid and clicking is just worthless as you dont get as much as you click for?