Unless you're a pro gamer or gold farmer, playing games is unlikely to net you any real-world salary, and yet many of us log into MMOs to continue our "daily grind". A serious commitment to World of Warcraft, for example, can leave one with a raid schedule more gruelling than a day job. The boundary blurs elsewhere, too, when you carry out a complicated task in-game that you couldn't do in real life.
The difference is that by playing a game, you have control over what you do, rather than relinquishing the reins to an employer. Perhaps this will lead to higher self-employment and entrepreneurship amongst gamers--certainly worlds like Second Life let you work in-game for real cash. A warning, though--once the game becomes a job, the roles may reverse, leaving real life as the fun distraction.