As a listing agent, I would never tell a lie and say that there were multiple offers when there are not. I believe that there are some unethical Realtors out there that will do that, but not many. Also, if I have multiple offers, I am more than happy to (with the sellers consent) not only show those offers, but disclose what the highest offer is to all the other buyers agents. My fiduciary is to my seller, and to get them the highest price that I can for their home. My fiduciary is not to the other Buyer Agents. So there is absolutely nothing unethical about disclosing the highest bid. It may piss off the agent and the buyer who made the highest bid. But I represent the seller not them.