Harley Quinn,
It is a single flying unit but one of three units on the station AND there is a commercial flying outfit in Hawker Aviation, who must be paying a commercial rent for their premises plus contributing to airfield operating costs. There is hardly a surplus of military airfields left in the area.
The cost of reproviding that 70 year old infrastructure elsewhere AND an airfield operating facility dedicated to the team must also be eye watering.
chevvron,
The army are vacating Brawdy and the site is up for disposal. And after 2021 Leuchars will most probably be in a foreign country.