Well, more territory is always a good thing. I'm sure if that island sticks around, it will be put to good use. Real estate is one thing that holds value very well.
This is definitely preferable to having to buy (or fight over) land claimed by other countries, as they might have to do otherwise. If only they could figure out how to control the eruptions, to make the islands where they want, and the size they want...
Am I looking at this in the right way, or did I miss the point?