I'd like to think it is because we are a welcoming forum that appreciates intellectual discussion from other fans who know more about their team than we do.
That's why I stop by. I learned a lot from the discussions you guys had about the 3-4 defense when you guys got Rob Ryan. Read an article linked from here that broke down every aspect of it and even taught me the difference between a 1 gap and a 2 gap DT.
I don't let a bad apple ruin the bunch though. Every forum has those.