RBFried/E+ via Getty Images Warren Buffett once said that, "We are a net buyer of stocks over time. Just like being a net buyer of food. I expect to buy food for the rest of my life and I hope that food prices go down tomorrow." Diamond Hill Investment Group, Inc. (NASDAQ:DHIL) is an opportunity for long-term net buyers of stocks to invest in a business that has been chronically undervalued for years and that will continue to be undervalued. Diamond Hill has a simple business model, generates large amounts ...