I love meeting with entrepreneurs because most of them are full of optimism and often driven by a big vision. It is then easy to get into a conversation about that vision and how awesome it will be. But therein lurks a great danger and one that both entrepreneurs and investors (myself included) can easily fall prey to. Outside the room nobody really knows or even cares about your grand vision. Instead, your product is all there is. What do I mean by this? Even if you do a fair bit of marketin...