Sure, but most people don't watch the whole game. Similarly, most people don't listen to the whole game on radio. They tune in for a while and probably tune it out because they were listening in the car and arrived at their destination or for many, many other reasons. That's why radio announcers are trained to understand that you can't give the score of the game often enough. If someone tunes in, and they only have five minutes, they'd better hear the score in those five minutes or they're going to be mad. And while we all watch the games from start to finish a lot of the time, there are many viewers who don't do that. For them, something we've heard before is a fresh and interesting piece of information.