No assets, no income, just a steady stream of favors returned (like 5-star hotel accommodation, private jet transport).
I guess it’s also useful to have some cash left over in defunct political accounts, in case some emergency “walking around money” is needed.
Don’t forget when he was running for president and he thought all that campaign money was his personal expense account. He got all liquored up and bought the finest hotels possible. What a stupid ass negro.