Some people believe that their controversial posts would acquire too many comments for them to respond to.
In my case, I enjoy responding to your comments (I may not respond right away, but you can bet your last dollar that I would respond to them whenever the chance arises for me to do so).
The comment issue is a controversial one since there are those who believe that they are not obligated to respond to their comments.
Anyway, comments are a great way to get dialogues started (And everyone following the comment thread can learn something new in the process).
One of the main reasons that people close their comments is that they wouldn’t have the cause to respond to undesirable comments.
Now, for the record, bloggers can moderate their comments; it will not be published until it is approved by them.
Since, I am not the biased type, I have my comment feature set to accept all comments.
It is my opinion that the comment feature is a very important aspect of a blog and the deactivation of that feature takes away a level of intimacy from their blog.
Besides, comments are a nice way to acquire feedback and I am always interested in your point of view.