[sshine]

Anecdata: In recent times, to a high degree: programmers. I attended one music festival with a high presence of volunteers from the Esperanto community, and among these people, ~20% were programmers.

The grammar is mostly regular. It seems like the thing a stubborn introvert likes: You can hardly use it anywhere, but it has nice properties. And unlike Lojban, Esperanto is something you can learn to fluency fast on your own on the internet.