traffic exchange sites

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HI Everyone. I have joined alot of these traffic exchange sites. My question is does all these sites need refferals to make money on them. I have sites them to promote and banners, and I surf alot. Still nothing. I am also looking for another site like EasyHits4U. I am on my 4th payment with that site. I am beginning to feel I am wasting alot of time on the traffic exchange site with no refferals. I appreciate all who responds. Thank you