I think it is worth the effort to convince him if you are convinced that he will bring the startup forward. Convincing someone is not something to be done in 5

I think it is worth the effort to convince him if you are convinced that he will bring the startup forward. Convincing someone is not something to be done in 5 minutes. Ask him the question: what would be the worst case scenario you could face taking the risk? Show him what he might win - I am not talking about money, but experience, fun, responsibility, reputation, stories for his grand-children. Give him some articles of Paul Graham to read, e.g. "Why not to start a startup".