I used to think kind of like you, until I realized that the rich people would also buy military robots. Then they could defend their land against revolutions for free. Sure, it would maybe be kind of pointless (although, maybe by then there would be "super golf clubs" that allow you to play really big golf ranges), but that doesn't seem to have stopped people sitting on lots of land in the past.
That's interesting. Never really thought about the military robots. I guess it wouldn't take much for a "rich person" to pay an individual enough to be willing to fly a drone over a crowd of "poor people"