AOL Search uses Google’s engine, and also runs Google AdWords. A search basically brings up the same results at both places, so any differences in traffic from the two services are due mainly to differences in their users’ behavior.
Website 1:
AOL: ratio of paid clicks to total clicks: 62.9%
Google: ratio of paid clicks to total clicks: 25.9%
Website 2:
AOL: ratio of paid clicks to total clicks: 82.5%
Google: ratio of paid clicks to total clicks: 39.6%
Now the two websites are in different industries, and do differently on SERPs and have different bidding strategies, so you can’t compare across websites. But you can compare within a website between AOL and Google, and the differences in percentage of traffic from paid clicks is striking. For AOL it is twice as high.
These numbers were generated from over 6 months worth of traffic, including thousands of paid and unpaid clicks from both AOL and Google, so I think they are statistically significant.
Conclusion: AOL search users are much more likely to click on ads than Google users.
Ask Jeeves is the clear leader in people avoiding the non-paid results and clicking on the ads instead.
Vividence report is available for download as a PDF here [vividence.com].
The reason? Due to their "Do No Evil" policy, Google makes a visually clearer distinction between their paid and natural results on their page. So basically, according to the study, Google trains its users to *ignore" their paid ads.