I don't know what they did for a living but as long as you're not in politics I'm pretty sure you did generate some value to earn that amount of money, no?
Even if they got most of their wealth through asset inflation, they still had the foresight to put their purchasing power into assets, I don't think thats leaching that's just wealth preservation.
Having enough wealth that you don't need to look to your family or the state for help I think is ethically better than leaching off a 3rd party