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?
I gamble with intentions and hope of winning, not just to kill boredom. If there has always been one team showing their strength in a particular season and it's always a known fact that all of the legs will be won against their opponents, I won't bet against them to lose; I will still place my bet in their favour, and to make it more fun, I will choose options like predicting how many goals they can win with and in which half.