Maybe made up languages are interesting in their own right because they're made up, and are therefore a totally different endeavor than a "real" language. Mayb

Maybe made up languages are interesting in their own right because they're made up, and are therefore a totally different endeavor than a "real" language. Maybe people like to occasionally do things just for fun instead of for practical reasons. Also, where's your evidence that the people learning High Valyrian and Klingon aren't also learning Chinese, Russian, Spanish, etc.?