I've never heard of or met a circumstance that actually warranted Haskell. Not even in finance, those guys are totally wasting their time.

It's an attractive (I'm going to say "it seems" though you ought to take that for granted) intellectual rathole. Like some forms of philosophy, like many things. Thank GOD (despite being unbelieving at the time) I went with Lisp instead. And I got real speedups.