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?
Sometimes i prefer to bet on the underdogs, the dominant side cannot always win and this is something a lot of bettors fail to realize. Even though the chances of winning are low from the odds given but they might be in a better form than the dominant side, this is a way that the bookmakers trick the bettors. It reminds me of the game between Chelsea and psg, who would thought the dominant force would lose.