~snip~
We need to be practical and wise, if you find a value bet and you manage to win it's always better to rest out and enjoy with the money that you earn, you win some and probably you lose more, that's how most of the gamblers understand when betting into sports games, if you know how to handle every situation and you can control your gambling habits. There's a chance that you can earn decently, not a guarantee though as you still inside gambling and just like what it's said from OP, the percentage of losing is higher than from those who can manage to win from this activity.
And don't even think about continuing to play gambling because that can lead you to losses and eliminate the money you previously earned. But many people don't understand this rule and instead try to play one more round, but they increase the stakes in the hope that this one last round can give them a big advantage. But they lose so much money that they only regret it because if they had stopped at the last win, they would have been able to enjoy the winning money and not lose it. And there are indeed no guarantees for winning in gambling, so we have to know the situation.