I have no interest in learning things I don't need. Sure, it would be cool. I actually took 2 semesters of Spanish, and 2 of German. But I wasn't interested, and I've since forgotten most of what I knew because I don't have any reason to remember.

I have music from all over the world, so I'm fascinated by hearing other languages, but have no passion for learning any.

Internationals learn English because they know its utter usefulness in the world. That's how things have become, no getting around it. It's become a common ground language. The prestige of being able to show off my vast intellect when traveling abroad might be nice, but no practical reason other than that.