I'm not the expert here (I've never paid money for sex), but I think that there is more to it than just overestimating ourselves as human beings. Paying for sexual services would maybe always come with a sense of uncertainty about to what extent the 'professional' is being exploited, victimized or abused, be it directly by the 'customer' or by the 'manager'..

No worries about that when doing it with a robo doll, not the slightest piece of guilt and complete freedom to do all the sickest things you can imagine. I can see some added value there.

The sex industry has made many victims, I think.