It is getting harder to earn money from those ads - clicking

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On the past few days, although clicksvista and quidscorner, with dollars4clix are up again. It is hard to get a chance to clicks its ads while I was online. I consider switched my attention to other sites, such as paidthefastest.com and leadprizes.com, also gptcashcow.com. Disappointment after another disappointment. After I finished clicking their ads, I just noticed all these ads were on the pending list, and after many days passed, I still not getting credits from them. What is the deal? Have that occurred to you too?