I agree. Business is business. The tact I took when I sold my Longez was that I was willing to wait a long time for my price---because I could (and I had a hard time parting with it)----and advertised it as a firm price only. In this case----come see what you think of the airplane--but don't offer me less money since I am not yet ready to accept less money. In this case, if you thought you were going to offer me less money from the get go---you just wasted both of our times.
In my case, I had a waiting list of people ready to pay the asking price.
On the other hand, if you don't advertise a firm price and someone offers you lower, you have 3 choices: decline (mtg over), counteroffer, or accept. I suspect what you were hearing is the owner more or less in the counteroffer stage----but you were probably subjected to his internal monologue------did I just say that outloud?