This 19-Year-Old Entrepreneur Is Exposing the Secrets of the Billion Dollar Underground Sneaker Market Posted byEntrepreneur Staff April 23, 2019 Leave a comment on This 19-Year-Old Entrepreneur Is Exposing the Secrets of the Billion Dollar Underground Sneaker Market Sneaker guru Brandon Webb shares his insights on flipping limited-edition kicks, a niche business that can have 1000% profit margins.