Agree. Whether a business (or solution to a problem) is interesting, ingenious and innovative is a completely different matter from its being a good business. iirc warren buffet once said, "if it takes a calculator to figure out if it's a good business, it's not". In a similar vein (but with a different moral to it) my boss used to say that (in a corporate context) all back-of-the-envelope analysis was by definition correct - because it would only ever be checked via back-of-the-envelope calculations.