An unnamed billionaire spent $627 million to convert a 600-passenger Boeing 747 into a luxurious plane that will hold only "dozens of guests," according to the Daily Mail. Good luck getting an aisle seat now.
Of course, not all billionaires can afford to convert a jumbo jet into a sky palace. For the slightly less stupidly rich, why not give your home two pools on two different levels of your estate? Because you're rich, and you shouldn't have to walk up or down flights of stairs.