I've been a fan since the mid 70s.
When I was a kid, if the games weren't on TV, I would turn on the radio broadcast and manage my own "Game Tracker" using my electric football game.
When I was about 14, I had a buddy who's grandfather ran one of the concessions. I went to help out on several occasions. I'll never forget the first game I worked. I'd never been to a game before and we got there about 9 am, picked up some supplies and got into the main concourse on our way to the stand. I just had to see the field, so I turned up one of the tunnels and when the field came into full view, I just stood and stared. Got chills, it was awesome. Our job was mostly just making the hot dogs, which were done ahead of time during each half, so we got to see most of the games.
Like many have said here, we're not just fans,....The Bills become part of you.