Microsoft pushed personal computers to masses and the productivity gains fie society are insane. You really think they don't deserve 50% from every excutable for their innovation and vision?!
Ever heard of CP/M? That was an improvement over having every manufacturer ship it's own (unmaintained) OS. Microsoft's genius was seeing the value in Software, not just in shipping physical goods. And people believed they were crazy at the time.
Didn't they? QDOS was bought, but 9x and NT were mostly MS with a little bit of IBM AFAIK.
Microsoft didn't build those computers.
Microsoft didn't sell those computers.
Microsoft didn't ship those computers.
They merely licensed their OS to the manufacturers and/or end users.
The X Box would be a better analogy, and MS does get a 30% cut there.