What profit does an app like Tongcheng Travel make by selling a lot of scenic spots tickets at low prices?

Although the merchants shouting "1 yuan to visit Xinmatai" seem to be unable to make money on the surface, they have earned enough attention and gathered popularity (as long as someone comes, they are not afraid of not making money). Although tickets are not profitable, they can be retrieved from other places. These app owners know that low-priced tickets are just gimmicks and an introduction. The real purpose is to promote other activities or other products. On the other hand, it also saves a lot of advertising expenses. The same is true of those 9.9 packages on Taobao, which are so low that people vomit blood. They are just a sales promotion method for merchants, in order to attract people to watch and drive the sales of other goods in the store. Compared with throwing money on the through train, this promotion method can save a lot of advertising expenses. Of course, there are also many sellers who make fakes. Obviously, they still engage in low-price promotion when there is no goods, which leads consumers to place orders one after another. After that, he just delayed delivery or told them that the supply was insufficient. Finally, many consumers had to cancel their orders. However, the purpose of the business has been achieved. As a result, the flow of people in the store is considerable, and some goods that cannot be sold for several months are also sold one after another.