…the next pick to the people who saw you pick the “winner”. Now half of those people see one team, the other half see you pick the other team, and whoever saw you pick the winner thinks you’ve got a 100% accuracy rate over two games. You could do that for a while and then offer to sell your pick for the Superbowl. Starting with a big enough group in the beginning, this might be really lucrative.
But is it legal?
The better way to do this is to ahead of time predict the number of games you’ll do in a row (n), and then create 2^n pseudonyms from which you post picks on a public site.
After each, abandon the pseudonyms that guessed wrong.
At the end, you’ll have one pseudonym that correctly predicted n games in a row, and especially if the public site you uploaded to has records of the times each pick was posted (or you used something like the web archive), you have a verifiable 3rd party record of getting it right that you can market to your full contact list, rather than cutting out your contacts in each round.
P.S. You could probably automate this.
Nice twist!