Is it reasonable for companies to apply for patents only by intermediary application fees?

Unreasonable. The cost of a company applying for a patent is not only the intermediary application fee, but also some other fees, including the application fee, examination fee and annual fee paid to the patent office, which varies according to the type and duration of the patent, as well as the agency fee and service fee paid to the patent agency or law firm, mainly to provide professional patent application services, so it is unreasonable to pay only the application fee.