I stop doing PTC sites because the time and incentive they give are not worth it in my opinion, unless u have tons of referrals.... Health issues for the head admin always seem the reason for the shut down of PTC OR GPT sites.... It reminds me of Cantbeatfree owner, who basically halted payment and communication to it's users until he made a final message about his health and shutting down the site...
Although I never had any payment issue from Cantbeatfree, except the last several months of it's closure... Some users basically felt cheated and scammed that they where not able to receive payment and also believed he took all the money they earned