Some people enjoy giving pleasure as much or more than receiving it, so if you fall into that category, it's natural to want your partner to enjoy themselves.
I agree that if you are a client paying for a service, the focus should be on the service, but now we are looping backing around to if part of what you enjoy is giving pleasure... then maybe the question is valid.
The actual answers from actual SPs have been similar, so either choose to believe us or believe that we spend our free time on here lying to make you feel better.