Games are a fun distraction from the real world. You get to do things that are impossible, cost alot of money, would get you arrested, or are afraid to do in real life.
Flying a spitfire in the battle of briton, racing around in a 100K+ sports car, commanding napoleons or Hitlers army, hunting down treasure in some deep dungeon. Some of the puzzle games make you think and keep those brain cells alive.
That and the fact that I dont go out as much as I used to and physical fitness isnt my thing