Oh yeah I completely agree that FP is nowhere close to being mainstream. Lots of mainstream languages are bolting on functional features, but there's a big gulf between doing that and using an actual FP language. That said, there are lots of places where you can use FP professionally, and it's not too hard to find a job where you can work with a language like Clojure. My experience with Clojure in particular is that demand for devs is higher than the amount of people who know Clojure, and that translates to higher salaries and better perks.