The financial forecast in a VC pitch presentation combines two different pieces of financial information in one chart. Still, you can treat them differently.
  1. The short term burn rate. This is information should highly precise and accurate. An investor is 100% sure she will "lose" this money. If you cannot be accurate, you probably do not have a clue what investment is required to build the company
  2. The long-term dream. There is no point specifying that you will have $50,342,784.12m sales in year 5. You just don't know and claiming that you do will lose you realism points. Explain to an investor why you think it will be ~$50m