There is no "correct" answer to this question, as the conversion ratio for a given site/niche depends on far too many factors to be simplified in such a fashion. Looking at the results of the research thestatistician.com has done is a good start, but there is no substitute for putting your time and money into some promotions/research of your own.
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<a href="http://www.oneverify.com/webmasters/_webmastersinfo.htm">OneVerify.com</a> new AVS paying $20 per TRULY free signup
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