I wondered about this as well. Though do you suppose the comments disappear after a given amount of time? I don't believe I've ever lost any comments, but I've read that others on my flist have and that, in the cases I can recall, they were comments in response to fics which may have generated more than 100 comments.
Perhaps it wouldn't hurt to ask Squeaky directly. I wouldn't mind asking if I knew how to contact him. I'd rather not go through support since in my case it was a member of support who brought the concern up in their journal. I don't want to cause anyone any problems but would still like to have an answer directly from the source since this is certainly something I think most of us would like to know.