I don't understand why anyone would pay a dime if the person was the "other guy's" broker. If a seller is retaining a broker as a buuyer's broker, the buyer pays the commission, plain and simple. If I contract with a broker to sell my boat his commission is MY responsibility, not the buyers - the buyer never sees that transaction. In this case the broker appears to representing himself as a buyer's broker. His job, therefore, is to get the best price for his client and the client pays based on the selling price. Bottom line, unless you have a written contract where this person is acting as YOUR SELLING BROKER you are under no obligation to pay him anything. That you would want to pay him something to "feel good" makes no sense to me. Put it this way, if you were selling your house yourself would you pay a real estate agent/broker his customary comission if he had a buyer (or was the buyer)? No, that's between him and his client. It would be extortion for him to expect you to pay him any commission. The ONLY way he could expect any payment is if he was working for YOU (or you have a broker and the property is listed with an MLS, in which case they split the commission).