Why IronPython and IronRuby?

From a Managers perspective, am questioning whether embedded scripting is really the only benefit that IronPython/IronRuby offer. Running Django or Ruby On Rails on IronPython/IronRuby is surely just of technical interest.

Sure there are always edge-cases, i.e. a throwaway or trivial project being undertaken by a Ruby/Python expert that might need to access existing .NET libraries, but outside of that?