Who is Ginsfarb from Collected Stories of William Faulkner and what is their importance?

Ginsfarb is the stunt jumper who plays a role in the story "Death Drag." He is described as a short man who walks with a limp and talks with unusual diction. Ginsfarb's greed causes his stunt pilot to suffer with a nervous condition. Ginsfarb refuses to smoke cigarettes because he sees the act of smoking as burning money. He also scolds the pilot when he "wastes" gas in order to save Ginsfarb's life during one jump that goes bad.