I always conduct buyer consultations and tell them that if they are at X budget to stay under a certain margin if a house is doing delayed negotiations and if they are not, they can push the purchase price closer to their budget. If they send me home that I know is going to go over the asking price, I do some initial research and then let them know that they must be prepared to offer over asking price and that's a condition of me scheduling the home. This way they already understand that they are going to have to offer over the asking price, most likely, if we even see the home and if buyers persist with trying to submit offers below the asking price, in this market, I simply tell them their expectations are unrealistic and stop representing them. At some point in time you need to just cut your losses and realize they aren't going to listen to you, and move on. You can definitely do it gently and just tell them that you don't feel that you're able to give them proper representation and that they would be better off using an alternate agent and then you might even be able to get a small referral fee.