I'll be honest, I haven't taken the time to understand it. I do know that when my son and I go to Vegas for college basketball tournaments he plays for hours without winning or losing much and keeps the free drinks coming.
Since I followed my youngest out of the old house when he went to college 5 years ago, my entire house now is my man cave. My pool table is where most civilized people keep a dining room table. The whole den is the gun room.