I’ve been experimenting with my Comments policy for the last few months. Comments are a blessing and a burden. The burden is that we have moderated comments on this blog, moderation takes time and effort, and there is no way with our current setup to effectively ban any given abusive commenter, so one is left to manually delete his comments one by one.
So I’ve decided to open comments when I feel like opening comments, which will depend on (a) how interested I am in seeing the comments; (b) how productive I think the discussion will be; (c) how likely I think the particular topic will be to attract cranks who need to be moderated; and (d) how pressed for time I am. I also may open comments for a time, and then close them if I either get too busy to moderate, or the comments have devolved into crankdom.