Most of the 24/7 gamers are either mid-teens who have no social life, or adults who aren't working, and have no social life. I'd say in most cases the 24/7 gamer adults are largely supported by us the tax payer lol. When I was really into gaming I would play around 5 or 6 hours a day, and allot more on weekends.
I recall one Saturday I played WoW for 19 hours haha.
Nothing wrong, I guess, with playing WoW as a hobby and occasionally getting a little carried away (I do that on Free Republic sometimes). But those 24/7 "get-a-life" players must ruin the game for everybody else.