[Lordarminius]

> I've never heard a successful founder say "I don't know, I just wanted to start a company with my friends and get rich."

I could not disagree more. Companies are started by all sorts of people: some founders have a definite idea that is a perfect fit for the market(Stripe,Heroku), some go over many iterations of their original idea and may even end up abandoning it for something entirely unrelated(Reddit), the last type of founder simply wants to be in business and does not even know what his product is yet(Steve Jobs before he joined Pixar). The only trait all founders share is drive and ambition.