The Dalai Lama. People who have tried to get his autograph say he just blanks you. Pretends he's meditating.
I don't see why he should give his autograph, he's a religious and political leader not a celebrity. Being in his company and hearing his words of wisdom is more of a gift and delight than his signature on paper.
Would you think it vile of David Cameron not to give his? The Queen?
Edit: I do think celebrities should be nicer to the public and fans as they're nothing without them and if I was a successful writer I'd do everything I could to make sure all my readers/fans were talked to and make it clear I was grateful to them but the Dalai Lama will always be the Dalai Lama (especially if you believe in reincarnation) regardless of our idealising of famous people.