well, the question bears clarifying. If the question really is how much is a game worth financially in the business world, there are actually pretty well established guidelines on how you can come to that estimate. (It's generally what I would care more about, to be frank)
Now, personally, I did my little math up there already. 1.5 dollars per hour of gaming time, if you include the console itself.
However, I was thinking more about this and it occurred to me that not all hours of gaming are made equal. The 16 hours of ICO, for example, while much shorter, is probably worth far more than say, 16 hours of Dynasty Warriors. So clearly, a different way of looking at it would be needed.
I think if I had to call it something, it would be an entertainment value ratio. Obviously, not all of these are rated equal, since it depends greatly from game to game. A game with a low EVR could be something like say, a game that is literally nothing but grinding, but never has any true engagement. Think of it as the farmvilles of the world, where you play literally just to burn minutes because you're bored. On the other end of the spectrum, you might only get 15 total hours out of say, the latest COD. But it might be 15 INTENSE hours that you just can't put down. So in those cases, the EVR would be considerably greater.
Obviously, this value is highly subjective. But I think it gives us a useful starting point here. For players who value their time highly, they aren't going to pick up the 200 hour game that has a low EVR. For them, a high EVR game is critical. In those cases, a sticker price tag makes sense.
The key then, is understanding how people lead to this number.