The advantage of star catering business is that their fan base is large, so if the stars open a restaurant, their fans will support it, so there is no need to worry about the traffic. As long as the stars call, fans will definitely rush to the restaurant. This is the "star effect", because of this effect, merchants will let the stars speak for their products, not to mention the restaurants opened by the stars themselves.
Let me give you an example. Before that, Sean, the star, took a mala Tang restaurant to court because he violated some rights of Sean. What's going on here? It turns out that this restaurant is called "Sean Mala Tang", but it's nothing with the same name. The owner of this restaurant is Sean. But! In order to make the business better, the restaurant owner not only pasted posters of Sean outside the restaurant, but also told the guests that the owner of this restaurant is the star Sean. Of course, in the end, there are more and more customers in this store. This is the effect, the star effect produced by a star opening a store, and there is no need to worry about no passenger flow.
Finally, there is actually another advantage. They are not short of money. The fees for star announcements in mainland China have been softened. They don't care about the money for opening restaurants, because they only take catering business as a sideline.