When Google decides your no longer of value

One of my sites has been ranking #2 for 3 MILLION overture term (means there is 3 million or more searches done according to Overture). It also ranked for many 6 figure overture terms and was getting tons of traffic from Google for various phrases. Then I switched from Google AdSense to the Yahoo Publisher Network and magically the site fell off for its incredible Google ranks after only 3 days after the contextual advertising switch. I honestly do not believe that 1 thing had anything to do with the other but it is interesting. Maybe it didn't suffer a penalty but perhaps it was given a bonus because of the amount of income that was coming in ? Interesting... I talked to my rep at Google and she assured me that AdSense had nothing to do with Google search.... well whatever. Here is the interesting part. Although this site (which I would like to keep anonymous) was getting huge amounts of traffic from Google when it fell back in the search engine I noticed ZERO decrease in contextual advertising revenue. Also subscriptions seem to be staying stable. The only thing that fell off in a big way was affiliates. Things like free ipods and free psps which were paying hundreds per day were paying about 1/3 of what they were. In a way this is good becuase I always wondered how important Google search engine traffic was to my site. Being that the site fell off yet revenue for the most part has stayed stable leaves me feeling pretty secure. So really the thing I come back to now is just make the site and screw the search engines. They dont love you and they will drop you when they want. It is after all "just business". At first I thought I would just switch back to Google but being that YPN is paying over 3x what I was making in Google AdSense I really could care. Also YPN is so much nicer to work with when you have questions or comments. A lot to be said for getting a live person 24/7 who can answer your question.