Haskell is a very good flag for the kinds of people that make good programmers:
* It's hard to learn.
* Chances of getting a job are minimal, therefore people learn it mostly for their own self edification, and have the kind of grit that keeps them studying for a year or two with not external reward.
* Learning Haskell teaches you some fundamentals that aren't readily discoverable elsewhere.
No one is hiring Haskellers right now, so what you have is a pool of very able programmers, who would love to do Haskell (in fact many would love the chance to use Haskell so much that they'd take a pay cut to do so) and very few people offering them what they want.
If you're a start up, you want to hire a stellar team (possibly at a bit of a discount) and your domain is a good fit then you should seriously consider hiring some Haskellers and letting them write Haskell.