To hone in on this point, I certainly do think message boards can be a waste of time, but perspective and moderation should be considered. For me, I'm a displaced Bills fan living 7 hours away. I've been a member of this board for nearly two decades and it's a way for me to experience community around our common bond. I don't think its much more complicated than that.
The reasons for your persistent agitating presence, however, are somewhat more elusive to say the least.