One thing I do want to point out is that there is the option, when registering for the forums, to make a "reader-only" account. However, the forums were always meant to serve primarily as a place where authors could find some community.
I think every site approaches the issue of communication between authors and readers, or communication between members in general, on a different level. There are sites where the notion of community is non-existent, and other sites where members could engage in lively conversation right on a reply segment beneath the story. One factor that might affect how a site goes is moderation, and how the site chooses to approach things like negative reviews, trolls, flames, spammers, and so on.
I do think the threads here on the AFF forums, where we could all find some common ground other than fandoms or genres, could be livelier. I'll have to plead guilty to getting caught up in things beyond chatting on the forums. (NaNo is coming, NaNo is coming!)
So, if anyone out there, especially some of the newer folk, want to see if you can start some lively conversation going, I'm all for it. I'll do my best to chime in, and maybe we can make the forums as lively as they should be.