6) Small Holding Landlords: They plow every last red cent into their buildings, the future rents from which they can live on forever. $0 in savings.
7) Entrepreneurs and Business Owners: See #6, but with a different form of business. Like farming massively valuable dirt, which when sold represent the retirement savings.
8) Some Homeowners: Some people weirdly put all their money into the most lavish home they can afford with all their cash. This is perhaps not a wise long term investment compared to stocks, but it does tend to keep up with the rate of inflation. When you retire penniless with a $1.5M house, you are not poor. You can trade out of that house and live well for a solid decade or more.
(To be continued by me and others who wish to chime in…)
9) Gold Bugs: They have theirs in untaxed bars buried in the back yard. ;-)
10) The terminally ill: They should probably gift everything immediately upon a terminal diagnosis to avoid confiscatory estate taxes.
11)