Google is essentially chaos. In search quality in particular, once you've demonstrated that you can do useful stuff on your own, you're pretty much free to work on whatever you think is important.
Thatís the way I have envisioned Google for years. Many employees just flitting from one project to the next with little thought to the repercussions they wrought. How do you supervise hundreds of eggheads each whom think heís more intelligent than the next?
Google has created a superb "signal" that a website is crummy: Adsense.
That one literally leaves you laughing because it is so true. Any company that can convince people to put Adsense right smack at the top of pages is not interested in the quality of the site nor is the owner. Itís a click scheme. Its like saying the site is junk right off the bat. Plus I would think any company who has convinced people to engage in such a scheme knows youíre dependant on the positioning for revenue. Why would they pay the vast majority, duped into this, much more than pennies?
Which begs the question, is there any proof that Bing devalues pages with adsense on them?
I think the better question is do they have a financial incentive to promote them like Google does? I see no evidence Bing is demoting them though. I do see a public that is becoming vastly aware of a built in bias that Google has in its results just by the enormous volume of Adsense sites. Will the public come to distrust sites that have Adsense on them? In other words the vast majority of the pages are strictly being created for Adsense income. Youíve got to question the messengers eventually.