Fred Wilson at his best:
When everything goes well, you really don't need that much from a VC. Of course, I have added value in all of my winners. But its the ones that don't work that I have left my blood, sweat, and tears on. And that's the paradox of being a VC that cares. Which is the only kind of VC you want to work with.
From http://www.avc.com/a_vc/2013/03/when-things-dont-work-out.html