Do you believe a Domme has responsibilities to her clients?

I found myself in a spirited debate with another Domme this weekend, regarding client limits and rights. She believes subs have no rights once they enter her Dungeon. She decides when to test limits, and when to break them. Her argument is, "If I don't do anything but what a sub wants, I'm nothing but a service top."

I believe there must be agreed upon limits. A responsible Domme respects a sub's hard limits. She does not violet his right to safety security and privacy.