I dont think that is what he is implying-- a relationship can mean many things
I worked in the entertainment business as both an performer with and agent and then as a manager/agent for performers--- we had a special relationship in that we knew each other well, not buddy buddy, but could pick up the phone and talk when needed with full faith in each other.
As a coach I don't get a buddy buddy relatiuonship with my players and parents but we have that special relationship in most cases where they can pick up the phone and talk about whatever is on their mind,
My relationships with my lawyers, doctors etc are not buddy buddy but they are such that if I call I know I will get a call back ASAP.
If there is not that "special click" between the two parties then it will be tough to make the relationship work--
It takes more than just money and professionalism to do the BEST job possible as you put it.