I have argued this on a thread before and not quite long, but maybe I am wrong. If you are not betting on sport like football, do not bother to choose either yes or no.
Since I have been betting, I have not thought of this before. Is the referee the reason you bet on yellow or red cards?
I have not bet on red card before in a match because it's hard to say if a player will get a red card or not, but I have bet on how many yellow card that will be in a match i.e the total. I did not win that bet and after I tried three different times, it didn't worked out for me, I stopped choosing that betting option. This is one of the advantages of sport bet especially, soccer because you have various options to bet on.
Maybe you do not know the referees well, I'm not professional either, but I've a friend that knows referees well and bets on strict referees for cards count and gets it right some of the time.
Personally I know players better and very on aggressive players to be booked. I'm Chelsea, I always very on Enzo Fernandez to get a card in the match because he's aggressive. When PEPE was at Real Madrid, we always bet high on him to secure a red card or at least a yellow on every tough match and he rarely disappoints us.
I think people bet mostly based on the nature of the match and players involved as against the referees officiating the match.