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...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?
I've thought about this with the stock market and predicting that it would go up or down. After enough predictions, one would have an email list of people that saw one accurately predict the stock market after n times. This could then be used to request payment for future predictions.
While I can't state that this breaks any laws, it is possible it might somehow. However, even if it doesn't, it's a really fucked up thing to do because it's conning people out of money using a scam. I highly recommend against it and responding to emails of people predicting future outcomes of events that vary wildly with any certainty.
So just the stock market then?