How much extra money did u earn by ' Rent-A-Ref ' option in neobux?

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Well, I have reached 3$ mark in neobux......... I am planning to use this 3$ to rent referrals........ One of my friends did this....... And he said that he was able to earn an extra money of only 0.1$....... How much did u guys or gals earn via ' Rent-A-Ref ' option in neobux????? HAVE A NICE DAY!!!!!!! HAPPY MYLOTTING!!!!!!!