Developing and maintaining software is costly. Reducing those costs means that less is spent on development of the software and/or that it takes less to maintain it. In other words: there are great merits in increasing the efficiency of software development and maintenance. An important intangible benefit of this is that software developers love "to do more in less time, and to do it properly".
At Hoppinger we are currently evaluating how we can use Haskell to better serve our customers, with happier developers and smaller development budgets.