Auxlangs are very silly things that will never see any meaningful success.
Conlangs as part of a greater creative work are kinda neat I guess, though it always disturbs me to think that many of such writers care more about making a world than a story, which isn't working with the medium. You aren't trying to write a series of fantasy novels, you're trying to write an atlas.
Other artlangs are all around rad. Particularly personal ones. I've been playing around with the idea of trying to make one, but I want to learn Sanskrit and Spanish first, and I want to have someone to talk to (so ronery ;_;).