Not really. In theory though, some of this self-limiting SHOULD happen. After 100 comments, the chances that I (or any other user) have something new and uniq

Not really. In theory though, some of this self-limiting SHOULD happen. After 100 comments, the chances that I (or any other user) have something new and unique to add is diminished. So, I think it becomes a natural throttle. If I still think my comment adds value to the conversation, I'll jump in. Maybe my comment is upvoted, maybe not. Maybe it is not even read at that point, but either way my cost is a few minutes of my time to potentially share knowledge or info. I try to contribute where I can, if my input is lost in the shuffle, I don't take it personal.