Pay Per Click

Well I have been clicking the ad's like crazy for a couple weeks now but have to say.....I think I am running out of steam. I wonder if this is the sites whole purpose. To get people to click the ad's and hopefully tire of it before they reach the minimum payout. Well I am still going to keep clicking I just don't think that I will be doing it with such vigor. I will keep all posted and if anyone has actually gotten paid for these kinds of sites please let me know.