I don't get it. Is it because rich people don't need heated driveways because they hire people to shovel snow? Evidently I don't understand either :D
A simple millionaire hires people to shovel snow. A multi-millionaire doesn't even think about such trivialities as snow, because their assistant has a budget and proactively makes sure the property is always taken care of. (Or more likely, they live somewhere where it never snows anyway.)