Help me try this site got any problem?

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I own PTC site. This is my PTC site http://www.sg-clicks.com/ But don't know why no people joining my PTC site. Everyday got more than 200 peoples visited my site. 100% referral for each level. But why still no people want to join it? Is it my site got any problem like joining part? So please some people join it and let me know what problem with it.