I think both college football and pro football pretty much get equal support, just not neccesarily from the same people. Like Larry mentiones, a lot of it may depend on the area people grew up in. Areas that do not have regional NFL teams, may lean more towards supporting local college teams more than pro teams. However, it is not always the case. Like our bikes, it all boils down to personal choice and preference.
Except for the couple of years I was in the Navy in San Diego, I have never lived anywhere with their own NFL team. But, since I was a kid, I have always been a Chargers fan and never really been loyal to any certian college team, although I have always hoped the local colleges did well.
Soren