All of the teams that have their own forum on PBN have contacted the staff of PBN and requested a forum. They have also agreed to actively post on their forums and uphold the standards and rules of PBN. Only after doing that, will a team get their own forum. PBN does not go out and contact teams and ask them if they would like a forum, teams must contact PBN. So that is why your favorite team does not have their own forum.
We don't just hand out team forums to every team out there. They come to us.