Well, if your livelihood depends on it, sure, go for success.
If it's a pastime, something you do for fun, valuing success over sportsmanship is... stupid. Yes, you can say "i only have fun when i win". That means you don't enjoy the activity, you only enjoy the fact of victory, which makes you an idiot: all the time you spend training, and then the time and the effort of the matches themselves... only for the few seconds of euphoria upon obtaining victory? Better find something to do that makes you happy during training and during the gameplay.