Like I said if we follow your logic that whatever an enduser pays is market market then that would mean no enduser ever overpays or underpays for anything. People overpay/underpay for things all the time.
At times an enduser desires a certain name that fits his business model, even when there exist other similar names.
Not unlike that restaurant example you give, which may want to be in a specific location. I would assume that they fit that amount in the budget of their business plan that they had already laid out before purchasing the necessary material to build the establishment.
over/under paying for a piece of property is subjective, which can contribute to the reason that there exist speculators who purchase real estate, yet the one that is of most importance, I would venture to say, is the enduser who determines that the establishment is to be built here and nowhere else, whether it be a physical piece of property or a stake(or, if a restaurant, steak) in cyberspace. That may indicate if the price is too high for the enduser, the name is not bought as a prohibitive price was not in their budget.
I won't say you're right just as I cannot confirm that you are wrong. This is just my opinion. All I am maintaining is that, for a serious business enduser, the price settled on is in general the price that counts and was already added in the equation, as it should have been in their respective business plan.
This does relate to your other posts regarding endusers and domainers, however. What you or I may view as overpaying for a
domainer very well may be the price that the enduser can cope with easily as it was already determined before its purchase. That makes the price justifiable, not to you or me, but to the business to be built.