That's the size of it, Brendan
I too have a background which has exposed me to the realities of the commercial world and sales.
I understand that for some people it can be confronting to be faced with someone who knows how to and is keen to haggle. That's their issue. However, it is also important as a buyer to walk away if one senses that a seller is a little 'delicate' and unfamiliar with this robust form of behaviour.
But I'm with you on this one. You'll never know if you don't ask...within reason