I would agree with you if this was the ONLY place to talk about jpop, ayu, etc.... but it's not, not by a longshot.
Although this is the largest ayu forum, so it's kinda too late for an invite-only system to really work. if I started my own ayu forum, you can bet i'd make it invite-only so it didn't turn into AHS. AHS is just too big a group of people, too many different types of people here. I'd WANT my ayu forum to be small, tight-knit.... a group of people who had compatible personalities.
And my forum would allow swearing.
But that's my dream ayu forum, not AHS.