Hmmmmm. It seems to me that perhaps you are "addicted" to lurking.
One does not always have to "post comments" on a thread in order to learn something from it. As a matter of fact, I believe that some folks would learn more if they would be quiet long enough to listen to other points of view. Then, of course, there are those who suffer from the "closed mind" syndrome where no amount of evidence, factual or otherwise, will sway their opinions one way or another.