I agree with most of the games being P2P because F2P games tend to be more expensive than P2P games. Also, based from experience, there are lots of players in F2P games, including gold sellers and botters.
If what you're saying is right, then I think this would be a great game for me. I have been searching for a game that could scare the hell out of me but none succeeded. I hope this would be it.
I have just finished the first part and I'm very excited about the next parts. Blizzard is really great! Eventhough it took them years to release Starcraft 2. It is worth the wait.
So it's like they're leaving the content-making to the players? Personally, I think the idea of making your own quests is good. I guess we'll just have to wait and see.