earning through blogging

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We all know that one of the best way to earn money is through affiliate sites, but we can't sell anything if we have a limited readers on our blog. I have already tried traffic exchanges and some people told me that this sites will lower your page ranking on Google. Is that true? I'm thinking of using ptc sites to get some traffics to my sites, but I don't know if it will drive quality traffics on my site meaning those visitors that will be interested on my affiliate programs. Have anyone here ever used this before? Please share your experience!