Catching foul balls at a major league game. What’s the big deal?

To be honest I’ve never understood the allure of the foul ball or the home run ball. Even as a kid I looked at adults falling over themselves to get a baseball at a major league game with wonderment. I mean, it’s a baseball, folks. In the gif below, one of these bros caught a home run ball and he’s celebrating with his buds. And by celebrating I mean acting like they just won the Powerball. Still, being the open-minded gent that I am, I choose not to judge. Perhaps I’m missing something? All I know is, I’d never want to be one of these guys. So tell me, what’s the big deal?