I think this is because any topic gets locked after 3 months of inactivity. I agree though, user blogs should be an exception to this. By the way if you want to reopen your blog now I think you can ask a moderator to post in it and that will unlock it.
Oh and you should add a poll so people can vote on your suggestion.
This post was edited by Arturo on Apr 2 2014 02:04am