There are many profit models for buffet restaurants, some of which include:

1. Cost reduction: self-service restaurants can reduce costs by purchasing in bulk and reducing waste, so as to improve profit margins.

2. Increase the passenger flow: The cafeteria can attract more customers by setting the upper limit of food supply, more low-cost food to satisfy hunger, and setting the upper limit of a core food, so as to increase the passenger flow.

3. improve service quality: the cafeteria can attract more customers by improving service quality, such as providing better service and better environment.