I know that if many of us were asked to do something by our boss and we said "no", then that would be an instant sackable offense. So, I'd be okay to make the odd cup of tea, but there's no way in hell anyone could make me sing the song of a pop singer now dating my ex-fiance for a TV show. Give royalties to a chick to spend it on snowy vacations with the man that trashed me in a song? Eff that! Had Naya Rivera said no, it wouldn't exactly have been career suicide because 'Glee' is now on its last legs and no one cares about the show anymore.