PAID TO CLICK site's , SCAM or NOT?

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I almost tried all the PTC sites like clixsense, neobux, buxgs, buxp, company bux, etc. I've lost half year on clicking sites and waste my time. I only got $2 in 2 months, how can I earned money in that situation. Someone tells that it's not a scam because they got paid, but they can't show me the evidence that they are really paid. If someone read this, can you offer me some paid to click sites.