AdSense falling off?

My Google AdSense ad revenue has fallen off dramatically over the past year even though my daily page views for my blogs and non-blog Web sites are roughly at the same level. My suspicion is that the dropoff is due to a combination of fewer new and interesting ads (fewer clicks) and lower bids for each ad.

Personally, whenever I do view any of my Web pages, the ads do not seem very compelling to me.

-- Jack Krupansky