1. Time: e.g There are already carpool lanes where you can ride by paying an extra fee. Even otherwise, if you are rich enough, you can just pay the fine, which would be the added tax.
5. Power: Rich people already have power by having access to lobbyists or to the appropriate media. If you are rich enough, you can fund a movement on your own.
Others don't make sense in a democracy where everyone is presumably equal, e.g. writing thank you notes to richer people for being kind enough to participate in the functioning of the country. As another comment said, this is like moving toward a visible aristocracy.
Also, it is mostly not true that the country doesn't go to war unless the middle class majority is on board.