I think this is literally why salesmen exist.
One of my good friends is a real estate agent and he is helping me find a house. My job is to complain about every place we see. Every single time he finds a way to spin my complaint into a positive or something constructive. Roof leaky? You can get it fixed for $X dollars and we can work that into an agreement.
For a great salesman there is no objection that cannot be overcome.