Earlier quoted context omitted.
I'll throw a range out there for the sake of argument, and I'm really low-balling it: 25-30%
So what would be a single reason for person with $100MM of wealth to give $25MM away to wasteful, corruptive government? What kind of benefits the person is gaining by buying $25MM worth of taxes? I thought so too. Give that person a chance to reinvest these money into local economy, growing productive businesses instead of slapping the "filthy rich" label and suddenly there is a lots of capital are used for everyone…
Unfortunately many people don't appear to think like that. Or are willfully blind/ ignorant. Take your pick.