I suppose that is plausible.

The Island was most likely owned by no one, until Magnus Hanso crashed on it, he most likely claimed the island as his. So when DHARMA needed an island Hanso gave them the one his Great Grandfather discovered. So buying it would not even come in to the equation. (If that is true)

Getting supplies to the island would not be that hard, tell the government you are shipping the food to starving people. Get within the vicinity of the island, pop up your hot air balloons, then drop the food (Widmore hot air balloons, like the one Henry came in).

That is all speculation, and possibility. Your idea is just as possible. And I like it too.

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