I once had a client - I'll call her Becky - who had a penchant for long, drawn-out phone calls and email exchanges that frequently got in the way of my doing actual work. I tried all sorts of mitigation strategies, but at a certain point it became clear that my income from her business was far outweighed by the opportunity cost of doing business with her. It was time to let her go.
Have you ever had to "fire" a client? What was the final straw, and how did you finesse the end of your business relationship?