If I someone hits the $1 mark, they would probably be able to spend/transfer the excess to their children and relatives, and all kinds of shenanigans. It isn't a terrible idea, but it would require some complex regulations to avoid it being yet another way for the wealthy to spend money to influence things.
High tax rates had the same intended outcome by encouraging them to keep their money in growing businesses and employees reaped the benefits in the 50s and 60s.