If a startup never fails, it will never be successful. Failures (or the fear of) are what causes us to drive forward. They are how we learn what works and what doesn't work. Businesses must fail in order to drive innovation. Innovation is driven by the failure of a current solution. I, personally, would never be interested in a product or service that guarantees I wouldn't fail; because, that would mean I am not innovative or even relevant.

Without failure, what is a success?