I'd like to participate, but I really just don't want to end up paying another $35 for Portal 2, which is what I would be doing in essence, as I'm not particularly interested in any of those games. But, for those folks who are, or people who do just want to spend the money, that's a great idea.
I guess people are angry that Valve isn't releasing the game as early as they could, and instead are, in their eyes, holding it hostage. But that's really not quite true, as Valve gets to decide when they want to release the game, and if people are going to play along with this 'early release' concept, more power to them.