If nothing else, it's a way of demonstrating status - "sure, I could have an AI do it more cheaply, but instead I have an actual sentient being doing my bidding, because I can."
To give a parallel that I think is reasonably illustrative, it would not at all surprise me if in the future everybody else uses fully automated self driving vehicles, but the truly rich still hire chauffeurs.
Past a certain point of wealth, "because it would be cheaper" becomes a socially enforced reason to *not* do something.
