Too bad for them? Incredible. That's not a very professional attitude to have. You shouldn't choose technologies you like because as a developer it's your job to choose technologies that are right for the business.
Certainly, I couldn't have done what I did without Haskell, or with more traditional languages, like C++.
The most challenging task I've done with Haskell, was to find the right combination of parameters in orden to sum an array of satellital images, preserving a set of constrains. I couldn't have dreamed of doing that without Haskell. It was the right choice for the job.
When they discovered the tools I've used, they recognized the problem, but they treated me bad, so I search for another job.
Conversely a technology that is beneficial solely to the business presents the same situation. Your own productivity and motivation will be affected by the chosen technology, so working with something you hate with a passion isn't going to be that good for the business either.