I'd like to add something from a vendors point of view.
My "advertising" on this site consists mostly of showcasing my work, and offering a promotion to the members. When show-casing my work with my pictures, I use a watermark (to make sure my pictures are copyrighted since this is the internet), which, like most people, I apply to the BOTTOM of my pictures, so they do not stray from the main subject. If everyone were to remove AdBlock, my images would now have ads on them, at the bottom. Thus covering up MY "advertisement". I find this quite unfair considering it costs me hundreds of dollars per year to have the right to advertise.
Now, I know the reply will be that my investment is made up for with the work I get in return. But that isn't the point. The point is that one source of income is being preferred over another, thus telling me, that my money and I aren't as important as the one coming from those other ads.
Just a thought...