His voice is rad.
Max Von Sydow, from The Exorcist amongst many other things.
Little movies like Shutter Island and the latest Robin Hood. :dry:
I can't imagine voice acting for a videogame pays that well though, even for an "A-list" celebrity.
It's basically just one day recording, but I agree that lot's of people would probably do it for less or even for free.
It probably also has to do with status, Skyrim and the industry in general gets more attention when famous people are involved.
Just look how well that Brutal Legend sold, and everything about that game was horrible.