The referee is included among what makes people choose that option, the players involve also from both team are also the reason, there are some games even before it starts you know it’s going to be a tough one and one can be sure it can’t be without card though our predictions can be wrong, and referees history will also influence the choice of the player if the game is being officiated by a referee with long history of given out red or yellow card on every little thing gamblers won’t want to omit that option while chasing winning.