Well, you may be on to something with this idea. I believe that with the exception of humans, all eusocial species have specialized reproductive castes, while the workers are sterile. Certainly some humans are willing to give up their own reproductive success so others in the group may be fertile. We have professional "adult entertainers" so maybe it's a small step to professional parents?

https://en.wikipedia.org/wiki/Evolution_of_eusociality