According to my understanding of costume TV series, there are two main reasons why the ancients left without asking how much money after eating. First of all, they regard money as dirt. They know that a meal won't cost that much, but they still have to give it. It is common for heroes to walk on the rivers and lakes, be brave and rob the rich to help the poor. If one's own money is robbed or many people who walk the rivers and lakes are not short of money, they will not come out if they are really short of money. Therefore, they don't value money, but make friends and travel around the world. So, they don't care about the money.
Second, it's no use asking how much money is needed in an emergency or a plot. You can only leave it on the table, because one or two ancient coins can be exchanged for 1 0,000 copper coins. It is said that the salary of an ordinary person in the Qing Dynasty is only two taels, which means that there can't be so many copper coins in the shop to give you one tael of silver. Besides, the ancients may leave in an emergency when they do this, which is enough for meals anyway.
The bartender doesn't count, because they can see at a glance that this meal is far from so much money, and it is all given more, because there is a kind of broken silver in ancient times, and a meal is basically solved by a few broken silver, leaving a whole piece of silver naturally happier and nothing to count.
All of the above are based on TV story speculation, so let's talk about something practical. In fact, silver gradually became a currency in the Ming and Qing Dynasties. At the beginning, it was also a silver ingot, and it also had a face value, which was basically five taels. Later, there was broken silver, and the appearance of broken silver was exactly the same as that of the present one. According to the price at that time, according to statistics, one or two ounces of silver can buy 377 kilograms of rice, and the price of an acre of land is only eight ounces of silver. From this perspective, the average person will not take so much money out.
So people began to break the silver ingot into pieces, which solved the problem that the face value of silver was too large and difficult to exchange. After all, some businesses are small and have not changed that much. With broken silver, it's different. They can better buy equivalent products.