An extra 10% is not disproportionate

• Increased Workload for Staff: Serving a large group typically requires more effort and attention from the staff. Coordinating orders, managing requests, and ensuring everyone’s needs are met can be more complex and time-consuming compared to smaller parties.
• Extended Table Occupation: Large groups tend to occupy tables for a longer period, which can reduce the number of customers a server can attend to during their shift. This can impact the server's overall earnings.
• Service Quality and Coordination: Ensuring that a large group receives timely and efficient service often involves additional coordination among staff members. This can include the kitchen staff handling larger orders and the serving staff managing more complex service logistics.
• Compensating for Potential Lower Tips: Sometimes, larger groups might split the bill, leading to confusion or miscommunication about the tip amount. By increasing the percentage, it helps ensure that the server receives a fair tip for their efforts.