[BjoernKW]

That depends on your business and your business model. Some business models only work with at least partially closed source software while some profit from open source licensing (when applying a dual licensing model for instance).

Stallman is an extremist: To him every piece of software has to be free (as in speech) and if it isn't it's evil. He is an activist. So, it's fine for him to have that kind of worldview. The real world and pragmatic solutions often aren't simply black or white, though.