The reason nerds play video games.
Many nerds(experts) will play games they are good at as a way to get revenge against those who constantly pick on them or ruin their lives.
They feel good after owning an opponent so it literally boosts their egos and they don't feel so suicidal.
Jimmy got picked on at school so he had to play Starcraft to get an ego boost.
He clearly needed an ego boost, or else he wouldn't of joined a noobs game.