Plenty of people pay the bills with F#. And Haskell, Lisp, k, OCaml etc.
exactly, and more to the point, in these places colleagues are often of a higher caliber, and salaries are much higher to boot.
When I was interviewing for F# positions, I was getting offers that were ~50% more than what I was getting for C# positions. YMMV of course. The quality of engineering at the F# positions was also obviously higher.