I believe it is a Fox philosophy that viewers will feel a more emotional bond with the game if they see the emotions of the crowd. If it was just field shots, the viewer would feel like he's watching a video game or other contrived form of entertainment. If the viewer sees lots of shots of the crowd, they feel more like they are there and are part of the crowd. I don't know how true it is, but that is their belief. It does kind of make sense. When I'm at the game, I do spend time looking at the people around me. And I know there are plenty of people that are at the game that barely pay attention to it. Like the lady who got up five times to leave the section and only did so during an at bat last night. It would make sense that they would want the broadcast to do other non-baseball things (like scan the crowd) between pitches. Heck, Uecker will go off on a non-baseball tangent during some of the slower paced spots.