Well, as an entrepreneur who is 10 years into a venture where most of my mentors thought my time was better spent on whatever was hot at the time (big data?) I can say that the perception of rationality is, like all things really, very subjective.<p>I see something and they don't. I think I'm right and they think they're right. But I see what I see, and I want to go for it. I might end up being wrong, but ultimately the journey to that particular place is one of the sincerest forms of self expression I've found, and I can't do that as easily if I too heavily depend on the eyes of others.