They could make all that money up and more just by selling the TV rights. Come on.
That said, though... Season ticket holders have no financial standing to sue. As a fan, they gain nothing and are not harmed in the legal sense, regardless of whether the Saints win or lose. The Saints players and coaches, on the other hand, since they lost money in it (the winner's share of the championship game, plus whatever they'll make for Super Bowl LIII), could possibly sue.