All of that is true but when you add in all the costs including Mount Pleasant RAF base, these people are some of the most heavily subsidized per person in the world.
Somewhat of a thread drift but Argentina invaded the Falklands because penny pinching Maggie had announced the retirement of HMS Endurance and the withdrawal of all UK (Marines) military from the S. Atlantic and this served as a green traffic signal to Galtieri when he got drunk one day.
So Maggie was/is responsible for the costs of maintaining Mount Pleasant and not the people of the Falkland Islands.