investing in affiliate and other money making sites.

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Hi everyone, can anyone tell me if it is wise to invest money on the affiliate sites. I know there are a lot of scam sites out there. So I am a little bit skeptical about investing. Do these sites really help you in promoting as they promise to do. Another thing I wanted to know that has anyone ever upgraded in any of the ptc sites. Does it really help? If yes please let me know about the sites.