paid to click?

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If you're on any of the paid to click sites and have upgraded your acount, do you feel it was worth it? What level of upgrade are you at and how much of a difference has it made to your earning? I'm really thinking of at least trying one level up on one of the sites that I'm doing well on, but worry I'm just getting taken. Also anyone familiar with agoloc? Sorry if it's spelled wrong, I'm a little confussed with it. Thanks, Ranae