Personally, I generally avoid those posts that have anywhere from 100- 1,000 posts. I haven't seen the benefit to them at all. To me, it's a place where hundreds of viewers post their views, and really, who cares?
It's like you have to post, run, forget and move on, and to me, it's like talking to a brick wall; who's going to read it anyway? Not the poster above or below, or even the OP (if there is one) when there's literally hundreds of posts.
I've found it interesting to read the first maybe 20 or so posts, then skip the pages to the end, and read how much the comments have morphed, as if no one by then has even read the OP, and and from what I've read, it can be quite wild and OTT by then.
I agree with this @Autonomouse
I'm not so sure about your point about the Chat forum though. In the past I've had some horrible experiences on Chat where posters have ganged up on me and been very unpleasant. And I've found it very cliquish. Not so much recently I admit but i'm always quite wary of posting on Chat because I very much feel an outsider on that forum. Which I suppose shows how every user's experience of MN is different.