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this is nothing new... all the ads network are exchanging traffic, for exemple, if you are a advertiser who pay 5$ CPM on adxpansion a traffic broker who is working with exoclick may buy from exoclick to send to you since exoclick would sell only 4$ CPM. he would make 1$ CPM profit.
I remember buying exoclick traffic and while checking the sources it would come from place like traffic junky, ero-advertising, adxpansion...
Highest the CPM highest the amount of traffic sites may send traffic even if buying only from one.
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