all depends on the keywords youre after - there is a wide spectrum difference between say a keyword like sex or porn between the two indexes - wheras something like the #1 spot for vigrx is about the same sales wise - traffic is huge from Google comparitively but conversion ratios are about the same.
As far as comparative for each word - the only way I would know to check that would be to have an overture advertising acct and a google adwords acct and then check their estimated traffic to the ads for the same keywords - might give an idea of the differences - but again its such a wide difference for each keyword.
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