Then along comes the seller (the whole "licensing" concept doesn't register either) and says "I'm gonna let people into your office to smash up your table. And all the crazy stuff you put on top of it."
That's just Not Done in the world of tables, and likewise for software in a lot of people's minds.
Add something about, "Pay up. I wouldn't want anything to happen to that nice little business you got there." and to plenty of people it's going to look like extortion, not the obvious result of the fact that software is not actually like a table.
(Personally, I'd want to say, "Move to open source. You can do what you want there." But I know that's even stupider than Microsoft. What are the chances someone who doesn't want to move from Windows to Windows is going to move all the way to some extrasolar weirdness?)