This is ridiculous. Any company that expects to turn a profit can't have employees spending significant amounts of time playing video games when they're supposed to be working.
This is why the "hey, come work here, we have XBoxes and Playstations" model is crap: You don't get a job to play video games, and people don't hire you do play video games (unless you're a playtester, then you'll play them til you hate them, if you can really call that playing).
I bet those guys at Mojang and Valve never, ever, play video games. I know this because their profit per employee is so high. I is clear and a logical conclusion.
/sarcasm
If I had a game company and I had an employee that was not spending at least 25% of their time playing our game and other games and telling me how to make our games better, I'd fire them.
This is why the "hey, come work here, we have XBoxes and Playstations" model is crap: You don't get a job to play video games, and people don't hire you do play video games (unless you're a playtester, then you'll play them til you hate them, if you can really call that playing).