Are you seriously suggesting that publishers don't receive "monetary benefit" from Google Search traffic? If you're correct, why is Webmaster World's Google Search News forum awash in screams, wails, and the sound of gnashing teeth every time there's a noticeable change in Google's search rankings?
The relationship between Google and Web publishers is symbiotic: Both sides benefit, in much the same way that both sides benefit when magazine articles are listed in The Magazine Index or the Reader's Guide to Periodical Literature.
Sure, Google AdWords clicks probably fetch higher revenues, on average, than AdSense clicks. But that isn't because anyone's exploiting or cheating you--it's because there's more demand (and therefore higher bids) for Google Search clicks than for AdSense clicks.