The Behavior Behind Users Clicking on Google AdSense Ads

A featured WebmasterWorld thread has a discussion about the rational that triggers people to click on a Google AdSense ad. There are many possible answers to the question listed in the thread, here they are summarized.

1. "Compelling on topic or relevant supplemental information"
2. "They don't know it's an ad (well "blended")"
3. "They know it's an ad but want to get the hell out (MFA)"
4. "Just boredom"
5. "because they are basically stoopid!"
6. "they want to buy something the ad represents"
7. " If they get something for FREE"
8. "If they find the caption of the ad attractive"
9. "If they trust your site they feel the ads are also genuine."
10. "Plain old laziness"
11. By "mistake"

Forum discussion at WebmasterWorld.