People may be excluded from the main capital/robot/AI economy, but they still need to eat, shelter themselves, and trade with one another. That produces an economy, even if it is informal or black-market.
So basically rich people trade amongst themselves while the masses live in squalor? That sounds as either a concept for cyberpunk book or a revolution.
Why would land and water and material be devoted to that by the robot overlords? Just cull the humans.