That research was Mediapost analyzing it's own site, which would not make it representaive of the internet as a whole. Mediapost is a website for "media, marketing, and advertising professionals," the exact type of people that know an ad when they see it and, hence, don't click on it. (Weird, because where does the low income, old, midwestern females fit into this site?).
Outside of this group, there is a large number of people that really don't know an internet ad is an ad. Websites and blogs that appeal to this type of group (non internet marketers, non-bloggers, non-advertising professionals) see higher click-thrus.
Even if you do a proper survey of non-internet-savvy folk and ask them if they click on internet ads, you still may not get accurate results because they would answer "no" to a question that asks "if they click on internet ads" if they do not even realize that an ad is an ad.
mathewi That's true, Tino -- many people may not even be aware that they are clicking on an ad if it's a text link, which I guess helps to explain why Google is so critical of sites that use such links and try to disguise them as content.
clicking on an ad if it's a text link, which I guess helps to explain
why Google is so critical of sites that use such links and try to
disguise them as content.