I think for freelancers it's very important. I built a couple of Bitcoin apps for well-funded Bitcoin companies, so next time I go to an event, I only have to w

I think for freelancers it's very important. I built a couple of Bitcoin apps for well-funded Bitcoin companies, so next time I go to an event, I only have to walk up to some people and show then what I built. That's normally enough for them to hire me. I'm not sure about entrepreneurs who don't do any contract work, but I think the domain expertise will really give you an edge there because you are much better at determining what problems should be solved in the domain, what solutions there currently are and what potential customers want.