Ptc sites Really pay to their members or not ??

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hello guyss i have been working on ptc sites 1 month ago...i really dont know tht ptc sites really pay to their member or not... i was working on highearningbux...The Minimum payout of that site is 20$..when i reached to my payout limit... They increased their payout limit to 30$...i think this is the biggest indication of scamming...what u guys will say about thiss ????