Working from the misconception that current "AI" can actually think, conceptualize, and solve problems, the rich would think that in the near future a legion of robots will mow their lawns, farm their fields, milk their cows and mine their iron. In this scenario they wouldn't need human workers anymore and would lose interest in money. To them money is just a tool to get other humans to do what you want without having to use direct force. If the robots would get them all the "stuff" they want there would be little need to purchase said stuff.