Some of us eschew most forms of competition ... I don't care if you can run faster or jump higher ... I don't want to play your silly game if it's about that.
Someone who wants to show he's better at something is kind of a boor. I really don't care if you can hit a golf ball further, but if you shoot lower than I do and have fun, I don't need to care.
I wonder if this is why things like Eurogames are popular ... it's not competitive and cut-throat, it's co-operative. There is no incentive to cheat, because it's not that kind of game. Why would you cheat when you're all trying to win together?
Contrast this with Monopoly where the object of the game is ... well, to piss off everybody else and claim victory and rub their noses in it. I despise Monopoly.
Winning seems like it comes from competition for scarce resources. But in situations in which everyone needs to work together, it can be counter productive ... yes, you're awesome, but we all need to achieve a goal instead of stroking your ego.
So, if you derive your sense of self worth from "I beat you", "I'm better than you", a lot more of your self worth is dependent on those outcomes ... and you'll take greater lengths to ensure those outcomes.
Sure, in some contexts competition is good, and achieves some outcomes. But then you can get a skewed perspective on what you'll be willing to do to achieve those outcomes.
Interesting. Usually until someone actually studies this stuff you don't stop to think about it.