Sure I can. I just can't think of any that are as appropriate or called for.
A quick look says he has a net worth of 67 billion dollars (and that's after we already taxed him, presumably, at about 35%.
A 95% tax on the remainder (which is harsher than what I actually was thinking, but easier to figure out) would leave him holding 3.35 billion dollars. I'm just going to go ahead and say that is, in fact, enough money for anyone. Keeping in mind that an actual 95% tax rate estimation would have to include what he's already been taxed, whatever that might be, and would leave him with considerably more.
But it was a good question. Since we're on it, I'll generalize: If I earn more, my tax rate should rise proportional to what I earn. It shouldn't be enough to prevent me from becoming filthy rich; but it surely should be enough to see that the country's infrastructure, medical care, and social safety nets are fully funded. Taxing the average schlub making just enough to support their family is destructive to the nation and to the society it supports. Tax the rich; See to it that the poor are fed and housed. Don't make people who aren't poor, and aren't rich, poor. Don't make the rich un-rich. Pretty simple idea.