12 hours play/12 hours rest

I suggest you develop games where you play for 12 hours, then the game is inactive for 12 hours, and so on every day until a winner emerges. I can't play during work hours, and I have to sleep. But I can be active the rest of the time (and I guess that's the case with many people). I play your game only during vacation. And many of my friends leave the game because they can't afford 24 hours activity. I can't understand the shortsightedness of the game developers, why aren't there 12/12 games yet?