This is all about relationships. Good ones do good in the long run.
I've used the Client/Supplier model most of my teaching career, and believe in it. Trouble happens when a student can't play the role of client, or doesn't know how to. The "fear of the grade" changes the dynamic to see the teacher as a boss.
But I think for attitude, it is best to see my role as The Supplier. Winning over the client. Speaking truth to the client via the "play money" of a grade.