As it most of the time that kind of result happened, even how high is the chance of winning once luck didn't permits you to win then the outcome still the same, same with how small the chance of winning but once luck permits, then you'll be able to make it, those gambelrs who loves taking a big risk betting with a heavy underdog once they've manage to select the right pick to put their money the profits / earnings is sweet more enough to treat yourself while still got spare for your next gambling session.
I'd rather sometimes choose the underdog with high odds and wager less than bet huge on the favorites because football is not something you can forsee the game unviels as it progresses. Nobody knows from which side the blunder that'll change the game entirely will take place.