I have had to correct the dealer a few times in my favor when I was the only bettor on the winning side,
but one time , I was sitting out a hand when the dealer made a mistake in favour of the players,
I corrected her and all the players lost their bets. That was one time when I should have.kept my mouth shut.
Luckily , the losing players understood the situation and did not mind losing fairly (too much) ..
Personally, I would prefer to lose a hand fairly over winning on a dealer error, but I just hate losing on
a dealer error.(just barely).