Take Call of Duty for example. I personally don't play it, but I'm aware of it's popularity. It seems that having tournament / clan vs clan kind of gameplay would garner a lot more revenue then say, golf or tennis.
Or what about League of Legends, the most popular game in the world (I think over 65 million unique accounts)? Do TV executives have a blind-eye towards gaming because of it's "childish" or "immature" stigma? Considering the amount of people in the world who enjoy video games, I feel like it's a missed opportunity from a business stand-point.
I don't have much (if any) sources to back up most of my claims, and most of this is also my opinionated observations.