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But if you are talking about click ratio for one particlual term when the site is ranked # 1 at all major search enignes, then you can get some good answers - but you might have to pool the results.
Generally in a competitive category [example: seo, casino, credit cards, loans.....], it is not really easy [however it is not impossible either] to get one site ranked # 1 at all major search engine at the same time for one particual good key phrase.
Man, I wish I knew where I saw the stats last, but I seem to remember that most people do not go past the first page of results of a search, and very few travel past the third page.
Hope this helps a bit.
A # 1 gets 2,8 times more clics then a # 5.
Sites on first pages gets 68% more clicks than on second page.
Sites on first pages gets 88% more clicks than on third page.
(Note that some pages like MSM show more than 10 results per page. This is why I used "on page" numbers exept for the first page)