I have been known to work with a client for 10 years and was finally successful in finding them a home to buy but if a client does not respect my knowledge of the market and repeatedly wants to make offers significantly below the asking price; I will fire them. I explain unreasonable offers are not good for my reputation with other realtors and is not a wise use of my time. I am polite but I explain. Sometimes they understand better once you have had this talk and the you don't have to fire them after all.