is it reliable to invest in neobux for upgrading.

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is it reliable to invest in neobux for upgrading. i want to become upgraded member there ,but i think that amount to upgrade is more there and hesitating to invest in it.though it is prompt site ,i was in doubt if we suspend there or if any problem is there with that site ,we will not get that upgraded amount within time. so any invested persons are there in it? and got the amount within one year? how much money u got within that period (1 year)? how much money u got, more than invested amount?