I don't get it.
Will the companies who have paid for adwords, have their balance charged for when they would have appeared on a page, but the individual has blocked them?
If I was spending money on adwords, I'd certainly want the answer to questions like this.
Just as a note, we recently received a £75 voicher from Google to spend on their adwords thingy. Is the chocolate factory starting to run out of coco beans? Read in to that, what you will.