"It is because I found Dave's view so compelling that I've been worried for sometime about the emergence of advertising in blog space. I'm not against it. I just worry about how it might put pressure on the 'doesn't have a conflict of interest' norm. If the virtue of the amateur is to seek the truth, that virtue could be in tension with the desire to earn more ad revenue. The simplest way to get linkbacks is to say the most absurd things imaginable."