If Real Madrid had good odds, it didn't mean that the team would win. Bookmaker odds are not a prophecy, they are simply a plausible report on the chances of an upcoming event. But this report only takes into account the obvious factors, and does not take into account those that we will later call "random". In fact, randomness is important and this is what brings intrigue to games. If all the teams that were bet on with high odds won, then there would be no point in odds. Even statistically, bets with low odds should lose, it will just happen very rarely.