Some channels have comments up, some don't. I think some are better suited to ongoing discussions than others. Shows like this do tend to invite more of the negative drive by variety. I can understand not wanting to have to even think about comment. I will say though, youtube comments are easier to ignore than blog, facebook or twitter comments. My podcast goes up automatically on youtube, and I used to do youtube videos. I still occasionally get comments. But I am not even aware of them till months or years later. They can be strange sometimes for sure (to this day my most hostile and angry comments were for a video I did on DVD region codes----which still kind of makes me laugh).