How much money would I win betting in Vegas, $100 the Steelers win the Super bowl
Can't say how much you would win betting on the Steelers since we don't know the odds yet. Once we find out who they would be playing against, the odds will be published.
You can pick a super bowl winner even before the season starts and get the appropriate odds. Don't know why you can't do it now. Try the sport's book at any casino.