Yes, and validating the assumption of a market opportunity is called finding product-market fit. Failing to do so is a leading cause of death among startups. An

Yes, and validating the assumption of a market opportunity is called finding product-market fit. Failing to do so is a leading cause of death among startups. An actual market opportunity, not an assumed one, is certainly valuable - which is why a VC will invest in it where they wouldn't invest in just an idea.