The executives who think good developers are "expensive" are generally happy to throw gobs of money at BPO firms to do the job half as well as in-house staff for twice as much money.
Besides which, an employee with a fully-loaded cost of $200k/yr can be sent to a one-week external class for well under $15k including salary, tuition, travel, and expenses. That's far less than the cost of acquiring and onboarding that employee; and if you don't care to train your staff, they'll jump ship for an employer that doesn't suck the stars out of the sky.
That being said, if you have the money, Haskell developers will absolutely follow - and in some domains the project will actually be cheaper.