It depends on the subject of the forum. GTA isn't something people can talk about daily for long periods of time. Once a new one comes out, people want to talk about it, but, when the game isn't new anymore, the conversations go away. I am a long time member of a wrestling forum and a lot of wrestling forums thrive because it's something that comes on TV each week, so, there is always something to discuss. Game forums, for the most part, tend to die when there is no new game to talk about. I also mod a Mortal Kombat forum, the same thing happens there. No new game, discussion is fairly low. When a new game comes out, there is plenty to do.