I gave a ran to many PPD networks in the market and out of them I found the best one to be ZuFiles. From ZuFiles : My best day was 165 visits, 150 clicks, $0.42 EPC and I earned $62.40. Absolutely this is the best network. I'm consistently earning $50 a day with ZuFiles. Even Zuuuu is also a member of this forum. Contact him he'll give you a bump in earnings to your account which can easily increase overall by 2x. They also have good contests every week. It's really great.