This time of year, people start talking about college football. The preseason rankings are out, but that’s not the hot topic. Many are discussing the changes in many of the college football conferences. The Big 12, Big 10, and SEC will add teams over the next few years. The Pac-12 is shrinking to four members. Some fans want to believe it’s about playing better competition. But it’s really about the economics of sports. It’s all about the money…