What distinction does Hal make between two different types of her clientele in the novel, The Death of Mrs. Westaway?

Hal separates her clients into two types. She feels little guilt about the readings she provides to one-time clients, such as tourists and soon-to-be brides. The people who haunt her are the clients who come back again and again, trusting Hal to provide them with solutions for the darkest problems in their lives.