I'll be in for at least a dollar, I think. The Darkness II and The Bureau are the only games I don't already own.
I am curious to see what they'll add. I own a lot of 2K stuff already.
Actually, looking through 2K's catalog, unless it's the season pass for Bioshock Infinite (and the average stays below US$10), I don't think they can offer anything that would interest me that I don't already own.
EDIT: I always plug this when I can, but I think Spec Ops: The Line has an amazing single player campaign. Extra Credits dedicates two episodes to this game. The first is spoiler free, and the second episode is best watched after beating the game. Link:
http://extra-credits.net/episodes/spec-ops-the-line-part-1/