My purpose for learning a new language was simply that it radically increased the number of people I can effectively communicate with in this lifetime. I chose Spanish because is super useful in the United States and Mexico/Central/South America are likely my next travel destinations after Europe. Plus it's easier for me than learning Mandarin, for example. But I want to go everywhere eventually, and there is just not enough time in a lifetime to fully experience every place. Maybe one day after I have experienced much more this thought will change, but I don't think I have ever regretted a day that I have traveled. I've never wished I would have just stayed at home. And no matter how tired I get, how frustrating it can sometimes be, and how much I get rained on, I'm always happy I walked out of my door (or tent) in the morning and experienced something new in my day.