can anybody share to me on how to earn in LEGIT traffic exchange sites?

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I heard that traffic exchange sites are good. I earn few cents from them but I never got the chance to reach the minimum which is usually 10-20 USD,. can anyone share to me some legit TE sites that can be potential income source? I am afraid to try some TE's. Last day,. I joined protrafficshop and I was disappointed. It says that $1 per referral. Through some forums, I was able to recruit 18 refs in 3 hours,. minimum cashout is $15 usd,. when I was about to cashout,. THEY SUSPENDED MY ACCOUNT! I don't know if I violated any terms for my account be suspended. I sent support ticket but no response. I don't know if they are just scams or what.