Glory
Your best shot at fame for running track? Become a celebrity for another reason and people will be like, "Oh, fun fact, so-and-so did track and field in college." Sorry, it's true. Most track and field stars are known for something else. This isn't a sport that churns out ubiquitous millionaires.
The only real hope of getting some recognition for actually running track, as opposed to being a hilarious comedian who happens to have run track, are the Olympics. Did you know those things only happen every four years? Seriously. We looked it up. And that's obviously not even your hurdle in becoming an athlete that both sponsors and fans care about.
Let's say that you manage to become the best at running, jumping, or throwing. So good that you get specially picked by the Olympic Fairy Godmother (that's how it happens, right?) to represent your country in the games. That means you're going to have maybe five minutes on television competing against the best in the world. Unless you set, like, all the records, no one will remember your name after a week.
Sorry, but those the breaks.
Track and field just isn't a big time sport. It can be fun, it can be a good way to stay in shape, but it's not something that'll make you a household name. Yep, the world isn't fair.