How do you tax someone buying favorable press coverage?
How do you tax someone buying a Congressperson?
How do you tax someone using their wealth as a threat, as a shield, so that they don't have to participate in the same kind of society as the rest of us, and can enjoy "privilege" (lit. "private law")?
Wealth at rest is not immaterial, and taxing profits or consumption will never work to reduce wealth inequality or the disproportionate power the wealthy have over the rest of us.
Lots of income may not make you wealthy but it lets you live a rich lifestyle. Move somewhere cheaper if you aren’t meeting your savings goals.