It is also not just about "inactive" realms. Some very active realms have a great deal of their activity in the higher parts of the game. If you aren't part of the right message groups etc you aren't going to be part of it. This is the problem much of the "involvement" in realms can be for solely for established characters in the realm. We need to ensure there is something interesting for new players to do in realm regardless of what the realm is currently up to.
