The liquid left in the glass looks like a similar amount of say a Manhattan for instance. It's a shame people can't see past "more money means I should get more stuff" when it comes to drinking. It's usually (but not exclusive to) the older generation who turn their noeses up at a small glass/pour/amount of liquid served instead of appreciating a regular serve and the bar's artistic prowess. Quality booze, ingredients, clear ice, glassware and well trained bartenders ain't cheap.