This is not true. Some professions are based on screwing the current client and moving on to the next one. How many times do you get to buy a house? This is why most people use an agent to sell their house. They can lie without seeming they're lying (sorry was unaware of xyz...that's what the owner told me)

The incentive for the agent is actually highest cash in down payment because they don't want to deal with the bank to get their money plus they get to keep the down payment if the buyer pulls out.