I've talked to at least one persons who works on production Haskell applications, and Jane Street, a company that was discussed on HN just yesterday makes heavy use of OCaml, but yeah they're pretty rare and I suppose the people working with them are just lucky. I've heard particularly about the Haskell market that if you want a chance of competing for the few jobs available you have to be among the top-haskellers, but I'm not sure.