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Us not knowing allows them to manipulate the percentages in their favor when in need of a positive financial outlook for their investors.
Things aren't going well? Decrease Adsense Payouts!
But hey, I don't care! My CPM with Adsense is higher than it would be with anything else, and THAT KEEPS ME HAPPY!
(my personal guess is an average of 70% based on intuition and the published financial numbers)
I suspect your "guess" is correct, but as you noted, it is an average and average numbers have little relevance to a specific website or page. It tell me nothing about what share I'm getting -- not that I even think about it much.
Based on the info posted in this topic, I would have expected anywhere from 40 to 60 cents per click.
The minimum bid for any keyword or phrase is very dynamic and will be changed if it was bidded in different time or under different account, campagne or ad group. The minum bid for Charlie Chaplin in one of my ad groups is $0.1. Thus, you might get about 6 cents or less if my ad was clicked on your site.