What is the point of anything? What is the point of life. There is no point, the point is that people have fun working on things they tickle their intellect. People are motivated by things that are hard, beautiful. People are motivated by things that haven't been done before. People are not motivated by the usefulness of a thing.

Plan 9 is a research operating system, it's a platform to do fundamental operating system research. It is not a product, and its development is not shaped by commercial interest.

That being said, Coraid hardware runs Plan 9, it's embedded, you don't see it. They also make all their development on Plan 9.