Because that one player might be Wilson Valdez. Woooooooo.
Although I'm not at the games, the only time I've noticed it on TV was the extra inning game when there were 500 people left. Maybe it's annoying when you're at the games, but so are a lot of other things. Over the air, I don't even know it's going on. And personally, I couldn't care less if the players like it.