Which professions are similar on mileage here? I think Chappelle was spot on, when he used the book ‘The Story of My Life by Iceberg Slim’ to confront the enter

Which professions are similar on mileage here? I think Chappelle was spot on, when he used the book ‘The Story of My Life by Iceberg Slim’ to confront the entertainment industry highlighting a concept from the book regarding "mileage on a hoe" (prostitute). He explains that a pimp understands there is a finite amount of "bad things" or work a person can endure before they "lose it" or break down.