1. Why do we assume blogging has to be dialogue? Surely there's room for content writing that is pure monologue? There's not one way to blog.

2. At a certain tipping point of notoriety, people would spend more time putting out comment fires and responding than they would spend actually doing the thing that gave them the platform to speak from in the first place.

3. Comments only work when there's community and a general sense of decorum. Places where they do work (e.g. here) work because the people have a vested interest in the discussion, the author wants dialogue, the people have a sense of tact, etc. Places where they don't work (e.g. YouTube) fail because there's no community. There's no accountability in Anonymity Land, so there's no tact. If an author doesn't want to make the time to build community around their content/writing, can you fault them for not allowing comments?