Think about it this way. The person who knows the most about your code and application, is most qualified to sell it, and has the best relationships with the be

Think about it this way. The person who knows the most about your code and application, is most qualified to sell it, and has the best relationships with the best fit potential customers, thinks it is worthless and wants to go in another direction. Code is cheap. Your legacy from this startup will be experience, not code. Move on and start fresh.