Ed, I don't agree with your assessment in the global view.
Specifically, soccer. They CAN add extra time. But in Europe, that is reserved for Cup matches that do, in fact, NEED a winner.
Curling has an easy to attain tiebreaker. An extra end is almost guaranteed to determine a winner -- you don't play for a blank in the 10th or 11th ends. You play for the win and are almost guaranteed it.
Racing has winners, though what's wrong with a dead heat? Do you want to get me started on why the f*** NAPCAR has PLAYOFFS?