How is it worth it? Again, I think it's great to learn a 2nd language but only if it benefits you somehow. How would Spanish help you if you got a job in Japan?I'll save you some time on the analysis. It's worth it.
I'm a "use it or lose it" kinda guy. So, I will never be fluent in any language other than English. And it wouldn't be worth it, for me, to spend $$$ to learn a language I'll probably never need.