Think about this. I mean really. You honestly think David Hayter is more costly for voice work than Keifer fucking Sutherland? They've also changed the entire process of their voice capture. It used to be the actors in booths with pages, and syncing to the words to the animation. Sutherland is now fully acting out the role of Snake with motion capture, and voice capture, which is ported directly into the game. Now, I don't know the figures, but I imagine this is an insurmountably *more* costly process, and adding Sutherlands paycheck in kills any chance of it being more cost effective.
. They want a name, and like "hey lololz Jack Bauer, omgz". Hayter's awesome and all, but he was probably causing them problems from a money-grubbing business sense