I switched to the SMF core theme recently, as it looks little different but the text is cooler. After browsing a while, I realized that advertisements are no longer displayed! Moreso, this behaviour is actually intentional as outlined by theymos in one of his posts about the average impressions.
This behaviour does not make sense. Although not many people are currently using a non-default theme, and obviously advertisements can be wiped out by user extentions anyways, why are the people who switch themes treated differently? An advertiser would ususally pay more for the people who are invested enough in the forum to switch themes, in fact, because they will have more respect and experience with Bitcoin.
Is there a technological limitation that prevents advertisements from being displayed, is it an oversight, or is there a benefit is hiding the advertisements for these themes?