Pay to click work or not

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Ive found if you spend time on them they do pay off eventually. Not going to become rich but some extra money doesnt hurt. What experiences have you had or have any links to some place to try. Few ive tried are: http://myhardroad.com/register.php?r=tammy http://newdawnfamily.com/ptc?refer=16 http://www.inverst-n-surf.net/?ref=1759