no reason to discard the idea of putting a ceiling on the rich.

There is a very good reason to discard the idea of assigning an arbitrary 'maximum wealth', two actually:

• it's effectively impossible to actually enforce
• it will cost us more to try to enforce it, than we will gain in revenue

It would be tremendously expensive resource-wise, logistically, to even reliably determine if one has reached that ceiling (net worth figures for individuals that you see in the media are guesses, not the result of actual auditing), much less calculate with any degree of certainty how far over the ceiling someone is, and that 'research/enforcement cost' is practically certain to completely cancel out (and then some) any potential added revenue, especially because it's also trivially easy to circumvent by creating debt, etc.