In sports, there is always someone winning dominantly. It can get to a point where they are almost always expected to win. By that point do you continue to bet on those favorites to keep winning or does it bore you? Would you enjoy stirring it up a bit just for the fun of it and betting on the underdogs even if the chances are quite low?
If you want to bet on the winner - you will get small odds. And the winner still can lose. It is not interesting to make such bets - your win is too small comparing with risk. With odd about 1.3 after your three wins on loss will return you to the start.
Of course it doesn`t mean that it is wonderful idea to bet big odds or losers. But you can choose another events with more balanced teams and more interesting odds.