I think Sports video games are not as fun to watch like following a real sports team where you can buy a ticket to watch sports live, or watch sports live on TV. The interviews with sports players after their matches are sometimes entertaining to watch. You can also follow players on social networks like Twitter, Instagram, and Facebook. Some players also interact with their fans on social networks, and fan meet ups or charity events like raising money for schools.
Some sports fans also like following sports because they find a player is attractive like David Beckham who has a lot of female fans who think he has nice looks, and is a interesting person.