To compensate for their hard work in providing non-standardized services, and to motivate them to be more dedicated to their jobs.
That is to say, the customer accepts a service down, and indeed there is not a "reasonable charge should be how much" to determine the answer; a dining activity down, the diner in the end should pay how much? Only according to the will of both parties, negotiation to determine.
In this way, we also let many of the catering industry charges, often judged as "unreasonable" charges, all of a sudden seems reasonable a lot, or at least, so that the charges "in the end reasonable or not" put a big question mark.
In a very similar vein, our major e-commerce platforms are actually exploring mechanisms for grading the market. On the one hand, it can avoid our customers to go to the store that does not match their status, affecting the pleasant consumer experience; on the other hand, it can avoid our many "primary market" in the face of the strength of the completely unequal customer, suffered a huge turbulence loss, this loss is manifested in the price of the dramatic impact, but also manifested in the resource This loss is reflected in the dramatic effect on prices, but also in the eventual inability to allocate resources to more reasonable consumers.
But in this case, the community, many of us consumers, take it for granted and presume it to be unreasonable. There is even a Shanghai University professor, idle boredom to, specifically on this type of mechanism to design a more advanced system of market classification, specifically to do some time-consuming and costly "investigation"; very ironic is that, in this "academic investigation" began before Ironically, before this "academic survey" was even started, our major platforms had already devised their own systems based on advanced theories, and were in the pilot stage.
Macro, based on the consideration of controlling the ecology of the community, it is indeed necessary to avoid letting people at different levels meet, and even more so, not letting them establish "individual" trading activities with each other. You have to start with information to try to do that.