In the classic "Superman's Billion Dollar Debt" and "Superman Owes a Billion Dollars"--SUPERMAN 114 (July 1957) and 148 (October 1961), respectively--it's established that Superman has a vast income. And in many of the old comic book tales, Superman could always mine tonnes of gold or compress coal into diamonds, whenever he was short on cash. Yet Clark Kent is supposed to be a man of the people, living a modest life without opulent splendour.
So which is it with the modern Man of Steel? Does he maintain a large storehouse of treasures that would make Lord Greystoke envious? Or does he convert all his potential wealth into donations for the needy and the deprived--keeping nothing for himself, depending only on his paycheque from the Daily Planet?