If they are Bills fans they are Bills fans.
Why do you ask how important they are?
Are they given any perks to be bills fans?
Should they be given any discounts to stay fans.
Should they have to pay more to be fans?
Should they have to wear a special hat to identify them at the game?
Should they have to enter the stadium at special gates?
Should they have to have a special decal on the car window to get them through the boarder?
Should the Bills play the Canadian national anthem at each game?
Should they all have to park in a special lot ?
Should they all have to wait for all the other fans to leave the stadium before they can leave?
Should they have to enter the stadium an hour before they let everyone else in ?
Should they have a French speaking announcer at the stadium?
Should they only be allowed to drink Canadian Beer?
Should they have to use a special Bathroom?
Should they make them clean the stadium before thy can leave?
Should they be allowed to be a member of TBD? (I say yes)