Probably some instinct that evolved over time.
I play poker for virtual money. I am almost a billionaire. There are people with trillions, so I am sort of poor.
When I catch someone bluffing, or play slow and fool someone, it makes really my day! I laugh, smile, chuckle.
American football, soccer, basketball, other sports. People go crazy.
Seems like we should be evolving out of such behavior. From a certain perspective, it seems very mean.
