“As I write this, there are only 5,458 Bitcoins standing in the way of a $500 price per bitcoin. That is to say you could move the market more than 10% with a purchase of less than $2.5 million. A big question among enthusiasts is what happens if conventional asset managers get behind Bitcoin. What if billions of dollars, not millions, were to flood into the market? It’s impossible to know, really. But what we can know is that the price would absolutely have to go higher. Right now, all bitcoins in existence are worth all of $5.2 billion. You couldn’t buy $10 billion of Bitcoin at the current price right now. There isn’t enough in existence. The hedge fund industry alone manages $2 trillion.”
http://www.fool.com/investing/general/2013/11/16/is-bitcoin-really-going-to-1-million.aspx