I always tell people this when they're looking for an agent - they should love your work. You are entitled to work with someone who believes in you. Why do business with someone who is ambivalent about you and your art?
As creative people, we should be really conscious of being of service in our work, being as generous as we can.
It should be said upfront that I totally dig people who work in bookstores and libraries. They love books, and I love books, and that is all I really need to know. If they are friendly to me, then we are clearly soul mates.