May I make a prediction here?
If another president and vice president of recent memory are any guide, I think a couple of years down the road we'll be hearing that yet another former president, who has never had a real job in his life outside of government, somehow magically has $250 million in his checking account. Or maybe billions in paper assets.
Sure, they obtained all that after they left office, sure they did. Except, nobody pays off an ex-president.
Same with Senators and Representatives - they go to Washington middle class - people who have never been able to make millions - and within a few years they're millionaires. Odd stuff.