I’ll start myself: I’ve been quite interested in Esperanto recently, and I am thinking of starting to actually learn the language. Esperanto is just really interesting to me, because of its history and size, compared to other conlangs. I don’t believe it will become the universal world language, like once was dreamed. And I do think esperanto has quite a few shortcomings when it comes to being an international auxilliary language. The reason I want to learn it is more just for that history and culture.
I’m not currently learning any conlangs, but a few years ago i learned some Ta’agra. I got into that through the Elder Scrolls, and even translated a short book from English into it. It’s been a while but last i checked it did have a small community that did actually use the language to discuss things besides said language.