Great stuff. Personally I agree on the disabling comments. I hate people.
No, just kidding. But seriously, it screws with your creativity and expression. Most people are doubters and idea killers. These are two different types of blogs we're looking at.
If you're blogging as a thought leader, disable it. New born ideas need time and absolute focus to mature. Cold water instantly dissolves the idea at its weakest stage.
If you're blogging to lead a community and get insights or thoughts, by all means enable the comments. Why wouldn't you?
One's a thinker, highly intelligent. His thoughts are far more developed than the average Joe. He blogs about ideas, theories, analogies, analysis.
The other's a guy who just does things, shares his experience, more of a follow the norm guy. Not that he necessarily does the 9-5, but he just follows what every one else is doing, because the majority must be right. He blogs about experiences, interviews, lessons learnt, updates on his life.