On a side note. It's comical the amount of work people are willing to do in order to block some ads.
I use two blocking extensions, because I prefer to spend the time to blacklist certain sites. MacDailyNews for instance. There are so many ads (and RSS feed lists) on their pages, that it's shocking to see how fast the site loads and what it looks like when you block them all. Most sites I visit are whitelisted by default. I still don't click on 99.9% of their ads, but at least they're getting credit for pageviews/impressions.