as valid asa lot of the replies are in this thread I think message boards like this or similar sites like this aren't that "active" because people really just care about the content or the influencer...
In this case, we're talking about JP. It's like when you're in a twitch chat and people are just typing things to get the streamers attention and ignoring what the rest of the chat Is saying.
I also think there's the problem that it's not "instant" and people like immediate replies, the type they get from a live chat, or Skype or any other messaging service. I don't think people want to keep coming to a website to see if someone replied to a post of theirs, or waiting for a notification that someone did.
I'll agree with the poster that said time zones, patron locked content etc are probably issues as well for some people. They might not want to be spoiled or feel like they can't participate in a discussion if they are behind on shows and not available to see all the content related to a RollPlay show.
I'll also reiterate that I personally believe a lot of people probably care more about getting direct replies from JP or other cast members and aren't interested in actual "discussions" any more, and JP for many reasons can't reply or answer every single message that comes his way, as much as he might want to, or try to. People probably feel ignored when that happens and then just stop posting all together.