Are Paid to click sites really worth of earning?

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Paid to click sites are sites that offer simple tasks by clicking the ads from the sponsors. The more you click the more you earn. The more you upgrade the more you earn money? How about those who cannot upgrade? How can I be sure that these sites are honest and will not scam their members. Is there anyone can help me to look for trusted and paying sites? I really need an income because I'm jobless right now and I'm trying these earning opportunity online. Please help me and I appreciate much for your help.