Superbowl Equity

[BottlesOf]

I'd like to hear everyone's thoughts on how much "superbowl equity" the 4 remaining NFL teams hold, i.e. what percntage of the time they win it all. I'd like to try and get 2 sig figs. in the guesses. I don't think anyone can reasonably argue that one team holds that majority of the equity, or that a team has less than 10/15%. I'm not really sure how I feel at this point, but I'd like to hear everyone's thoughts.