As bad as they are and have been for many years, the Dallas Cowboys are the richest sports franchise in the world. They were recently valued at 10.1 billion dollars, and they absolutely stink.
Me?
I wouldn't give a perpetually losing organization like that even a penny of my money. However, like you said, "the house," or the NFL, still wins big. Between ticket sales, jersey sales, the Collective Bargaining Agreement, etc., the NFL, team owners, and players are all raking in the dough, and the fans are left to foot the bill.