I can't fully answer that on my phone, but I will say that, at the same time, if we accept full price for what is, quite literally, a demo, the consumer game market is screwed. And, yes, it is a demo. I can't find it now, but there's an interview with Kojima where he talks about Ground Zeroes. He says that it was released because the full game wasn't ready, and he wanted to give fans a feel for what the game would be like, and what sort of things the team was working on. That's pretty much the definition of "demo".