They just need to make a point system. The incredibly wealthy don't care about money itself, those are already just points to them. So once you get to say 100 M, you get a trophy saying you won capitalism. After that amount 99% is taxed, you get a penny on the dollar. But all of that taxed money gets you Capitalism points. Capitalism points have no real value and can only be exchanged/traded/gambled with other winners of capitalism. Those with most points will be published each month in the top 100. And the top 10 each year get the prestigous title if honorary economic leader. They can get a medal and a pat on the back by the president.

You can also donate extra money for more capitalism points at a 10:1 exchange rate to get people to play the game even harder and further drive down wealth.

(I believe there are slightly less than 10,000 people in the US who would currently get their capitalism trophy. There are >140,000 people worth more than $50M, is 100 to high?)

Oh and the 100M amount is pegged to minimum wage. Any increase to the capitalism cap has to be matched to the same percent increase to minimum wage.