I've talked to many founders who seem to forget the basic "economic laws of the universe". You have to create more value (if you're feeling pessimistic, more perceived value) than you take to get something out. It's crazy how many founders get excited about how much they've raised, or at what valuation, while forgetting that basic fact. Every dollar you raise is one you need to put to work more effectively than the general market. A high valuation is basically a "discount" applied to any value you create, the higher the discount the more value you need to create to make the equation balance. It's scary to see founders that have significant exits (>$100m) walk away with very little, because they didn't manage to make that fundamental equation balance.