if you do lots of offers ? if you are denyed many times ?

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I try to make extra money by making offers ,but sometimes I always be denyed by the syestem. some website really good and they deny so little ,but some deny so much . for examples, at http://gptjoin.com/paidto/home.php?ref=sally_xu126 I finished 25 offers, and succeed 18 ,deny 7, so I think it is a good website and I can get money from it. but at http://www.intoffers.com/members/register.php?ref=sally_xu126 I finished 11 offers,but only 3 succeed , 8 deny. do you have this kind of experience ? or that due to my poor English ? if any advice you can give me ? thank you very much.