Sellers should never lower the price when they meet up with a buyer after a price has been set. This starts a precident with buyers will continue to offer lower prices at the meetup.
A few times when someone lowball me with an lower offer I have counter with a offer more then we agreed on. Shuts then up real quick.
Sugar coating things is apart of sales, buyers want to believe they are getting the best possible deal and 1 way to reiterate that is to tell them what the product goes for and making them understand the value if they were to otherwise buy it elsewhere. They leave knowing that they got the best possible deal available and come back more often then not.