buying referrals for your ptc site

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hello people, i came across two sites that offer to buy direct referrals for your ptc site such as neobux, here are the sites: http://www.getdirectreferrals.co.cc http://www.active-referrals.com (at the bottom of the page) these sites say that they can give you direct referrals for a certin amout of money my questions are, are these sites for real? do they actualy work or they are a scam? and if they work does it pay off? please tell me if one of you tried one of thses sites thanks in advance.