Even if you were able to take 90% of the one percentile's wealth and they did not run away, even then... what would stop them from deciding to pay themselves 8x more so they would end up with the same amount of incoming money as they had before? Oh and guess how they would do it... hire ten people to do your job in Asia, Africa for the price of a bowl of rice a day. Taxes are not a useful tool to correct bad behavior.