Clicks and conversions are the only true arbiter of customer satisfaction in search, and Google themselves admits this:
1) Google AdSense Sites (who host AdWords on their site via the content sydication network) are paid a CPC for their clicks based upon:
2) The conversion rate of the visitors you send to merchants (they know this through their "handy" conversion tracking tool), compared to other adsesnse publishers. If my traffic "sucks" I get $0.01, if it's "great" maybe I get $0.30.
Clicks and conversions, straight from the horses mouth.
Also, didn't you say this in an earlier thread [webmasterworld.com]:
I also frankly take issue with the idea that this free market needs correcting in any manor, and if searchers search less, but convert more, I would posit that this is an improvement to the current marketplace, and not a detriment.