anallawalla - 10:42 pm on Aug 5, 2009 (gmt 0)

Google doesn't tell its Onebox content provider partners how many impressions occur or how many clicks occur on a onebox listing, so very few people within Google would know that information.

Content providers can count how many click through to them. Most of the useful information is available on the "more info" page without needing to click through to the data provider. Therefore any guesses made by the content provider would be unreliable.

It would be a good project for the eye-tracking consultants.