At the PHP shop.

All sorts of places.

I'd be willing to wager that there's hardly an OCaml programmer in this world who isn't also skilled in a few other languages.

That still doesn't make a case to learn OCaml.

What it means is, People who learn OCaml generally have to learn something else too. Because the jobs just aren't there. Which in case the person is better off learning that something else properly.

And that is a very big problem.

I generally pass over resumes where someone doesn't list at least one programming language that isn't very marketable, fashionable, or part of C's extended family. It's a quick way to winnow out folks for whom programming is likely to be more than just a paycheck.

At a Scala or an Erlang or a Clojure shop, I expect :-)