Why does Guy Beahm insist on being so dominating?

This is because he likes to play dominating character and says that it has helped him master the game faster. Everyone has their unique style of playing and according to him, the dominating character suits him, which is why he continues to like the character.

It has often lead him to many wins as well. When the character has brought numerous fruits to him, he is willing to take it further and adopt the character for himself. This is why he continues to play the dominating character and have a better hold on the game. Every player has his own style and this is his preferred style.