MIT management prof Starling Hunter has done a study of BlogAds. I'm interested in seeing more studies of the business of blogging, such as it is. Hunter says that leaning to the left has brought in more ad money than leaning to the right. I wonder why. I'll just theorize that the political left is more comfortable with the web and more likely to advertise there.
For example, I'm grouped with some conservative blogs for the purpose of selling ads at BlogAds. (Here's the corresponding group for liberal blogs.) Despite being in this group, I don't think I've ever had an ad for a political candidate or cause (and I've never refused an ad). It may be that right-leaning causes are managed by people who are put off by the language and nasty tone of some of the right-leaning blogs. Nasty, bloggy things may be more tolerable to those with left-leaning causes.
Really, there are a lot of reasons for advertisers to shun bloggers. They actually don't know what we'll say next. Do you think blogs will grow up and come under commercial umbrellas that will somehow discipline them into ad-friendliness? That would spoil much of the good of blogging, though, don't you think?