Some invest it themselves into real estate, both in their own country (like highest towers, most fancy hotel, palm tree shaped islands) and abroad (skyscrapers and office buildings in various financial structures).
They're really setting themselves up for them and their future generations to remain rich and comfortable for the forseeable future even when oil dries up or demand goes down.
They're really setting themselves up for them and their future generations to remain rich and comfortable for the forseeable future even when oil dries up or demand goes down.