I appreciate being able to discuss the sale of a domain name with a domain broker representing a third party. Not only does this give me some insight into who the prospective buyer is, but it also reduces some of the friction in a negotiation.
The best part of working with a broker as a counterparty to a negotiation is the buyer has already been educated. A broker isn’t going to take on a buyer with unrealistic price expectations. The buyer is essentially prequalified to discuss a deal. The buyer may not have the full budget, but there will be much less tire kicking.