Maybe being competitively reckless is hereditary.

[But she looks so pleased, okay. Right now, she's grinning so broadly, it's almost a little worrying—like someone's about to get pranked. But it's no such thing.]

I give lessons in flying. I'd love to teach the rules of Quidditch, I've got all the balls and equipment here, but I don't think I'll ever have enough players for teams and a game. But there's no harm in going after a Snitch for fun or tossing a Quaffle back and forth. Why not?