Massachusetts Real Estate agents (including Realtors) are bound by contract to be loyal and obedient to "their" client. These are only two of the many rights a client must receive from their agent. This is not a matter of ethics, it is the law. Now, it's pretty easy to see how "money flow" could impact the process of being impartial because the selling agent earns more money if they act as an agent to both their seller and the buyer. Additionally, the agents earnings will increase with the property's sell price.