And for sure those who bet against the heavy favorite managed to cash out decently, not always but the feeling of enjoyment when somethin like this happen to your bet that's adds up to the pleasure that you gain when you are inside gambling, though those who chase for the same bets over and over might at risk, as for sure not every attempts will go on the same outcome.
Most of the time, favorite wins and a matter of timing and good analysis of the game may give you hint that underdog might pull the trigger and upset their opponents.
For these bets it is very important to choose an underdog who can do something against the opponent, imagine if you bet on Sunderland last season when they were terrible and only won two games all season. These are the bets that I consider impossible, because the team is so weak that it is easier to bet against them and win than to bet on them and hope for a miracle. I can sometimes wait for higher odds in live, but I am definitely not the kind of player who will look for a bet with huge odds on something impossible.