VooDoo Venture Capital: How much to raise?

Companies that raise $10 million dollar A rounds don't raise $5 million dollar B rounds, they raise $30 million dollar B rounds. If you have not accurately predicted how quickly you can grow the top line, you will quickly find that the cap table has gotten away from you, and you will have less flexibility to build the company the way you might like to if the market zigs when you thought it would zag.