Investment and ptcbux

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I have heard of ptcbux and have gone through many discussions about it. It seems that to gain maximum monetary benefit from the site, one need to invest there. In all other PTC sites, there is also a provision of investment to purchase rented referrals which may or may not be of any significant monetary benefit to the member concerned. Is investment in this site similar to that in other PTC sites or is it something special for ptcbux? Can anyone throw light on my query as because I have decided to join it shortly but I am not in favour of any sort of investment to any PTC site?