Can anyone tell me the perfect PTC?

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I'm a member of more than 30 PTC sites for the past 2 years and earned a good money, but at the same time lot of the sites are turned to be scam even after i got payments from that site, i really become confused. Which is the geniune PTC? Because i would like to invest for about $300 in PTC sites. If they show their real faces after my investment means, i probably will lose my money. So keep update me by your own experience in your well known sites. Even some may invested and earned good money from your favorite PTC sites. I expect legit comment to made me assertive on what i'm gonna invest. So experienced members may discuss about this. Thanks in advance.