Esperanto was designed to be easy to learn. It isn't an elite pursuit in the way you suggest, because its community isn't gatekept. I personally have met people of all social classes who have been interested in it.
It was also never meant to be a first language, it is an auxiliary language. It is possible for an English speaker to have a conversation with a Mandarin speaker with no intermediary if both know the (comparatively easy to learn) Esperanto. Its original purpose wasn't trivial either: it was created to stop groups without a common language in the same city (Warsaw, I think?) fighting, created on the basis that they'd stop doing so if only they could speak a common language.
Think of it as JVM bytecode for people.