I don't think there has to be a reason, any more than there's a reason why Americans say "y'all" or "howdy" or "dude". People just pick up habits from each othe

I don't think there has to be a reason, any more than there's a reason why Americans say "y'all" or "howdy" or "dude". People just pick up habits from each other. Beware of looking for deep reasons for shallow phenomena.