How many people watch sports at home?
Between Nascar, Football and Basketball alone, hundreds of thousands of people watch sports. In 2007 alone, 139 million people from 232 countries tuned in to watch the superbowl. In 2009 it was more like 141 million.
This is my first answer, so if it's useless, sorry. Of course dads watch sports, they have no any others entertainments to be done. And there's many sports channel in your TV. I don't think you expect your dad to watch cartoon, isn't it? They like watching sports (especially Soccer) with their friends so that they have something to do and not bored.