More on disappearing albums

In a comment on my article about Radiohead’s albums disappearing from the iTunes Music Store (as reposted at Blogcritics), Matt MacInnis makes excellent points about the leverage that bands like Radiohead and Sigur Ros may have in their contracts to negotiate better royalties for new form factors. I wonder why other artists with equally high leverage, like U2 and Sting, haven’t done so. Maybe because they’re on Universal?