In "I Sold Andy Warhol (Too Soon)," Richard Polsky weaves his personal story into the story of a business culture that has grown more venal and volatile in recent years. He paints art dealers as an entertainingly infantile, manipulative bunch. "The nature of the art business is that it's filled with pettiness and jealousy," Polsky writes. "That's because anyone can become an art dealer . . . so everyone is insecure about their accomplishments...".