I maintain that very few people have a reason to learn Sanskrit. It is a dead/dying language that will add zero value besides the esoteric joy of knowing a language for the sake of knowing it.
If you feel that is not the case, please elucidate your reasons. I'll be happy to be proven wrong.
And very few people have reason to learn LISP or programming languages, for that matter. (If we are generalizing, we might as well go the full length and include the entire world population)
You seem to be mistaken that folks would learn a language for just the sake of knowing it. Far from it. Language is just a tool for communication of ideas. There have been some brilliant treatises, thoughts, ideas, and philosophies expressed in Sanskrit. Folks are more interested in accessing the thoughts and works in Sanskrit as opposed being infatuated with the technical aspects of the language.
If you feel that is not the case, please elucidate your reasons. I'll be happy to be proven wrong.