1. The reason why the tour group doesn't provide lunch now is that the tour fee of the travel agency is very low: in some cases, the travel agency may offer a lower tour fee in order to attract customers. In order to make up for other costs, such as transportation, accommodation and tickets, travel agencies may set the tour fee as low as possible to attract more customers. In this case, catering may be excluded from the tour fare. Assembling individual travelers: In some cases, travel agencies may assemble individual travelers into a large team. Such a team may not be able to get enough seats in each restaurant, or may need to eat in different restaurants. In order to facilitate management and arrangement, travel agencies may arrange catering for themselves.

3. Special destinations: Some tourist destinations may make catering arrangements difficult or infeasible due to local dining habits, geographical location or itinerary. In this case, the travel agency may choose to arrange the catering for itself.