From Shusha Guppy’s interview of Tom Stoppard in “The Art of Theater No. 7” (The Paris Review: Winter 1988, No. 109):
INTERVIEWER Now that you are [famous], do you still feel excited by it, or do you think it isn’t that important?
STOPPARD Oh, I like it. The advantages are psychological, social, and material. The first because I don’t have to worry about who I am—I am the man who has written these plays. The social advantages appeal to half of me because there are two of me: the recluse and the fan. And the fan in me is still thrilled to meet people I admire. As for the material side, I like having some money. The best way to gauge wealth is to consider the amount of money that you can spend thoughtlessly—a casual purchase which simply doesn’t register. The really rich can do it in Cartier’s; I’m quite happy if I can do it in a good bookshop or a good restaurant.