Inflationary pressures and regression towards the mean. Whatever the cap is, it will also be a cap on the mean. That is, the cap will pull the mean up towards it. I mentioned lottery prizes. Some have been in the $60 - 70 million dollar range. I think this is an indication that people generally are no attracted to having a wealth in this range, and are comfortable with the idea. That is, people generally think $70 million is something they would like to have, so a cap of $100 million would be more palatable. That cap is just above the limit most middle class people would consider as ‘super rich’. As an aside, there are some super-homes that go for $50 million in our large cities. It is more about psychology than economics.