I would just go for using height like you mentioned, if you, an average person is 6ft tall, someone with a better job than you would be up to a foot taller than you, a millionaire would be tall building sized and a billionaire would stretch into space.
I guessed all of these values, I might do the actual math at some point, but not right now.
I did the rough math. If average net worth in the US is 80k, and bezos is worth $90 billion, then compared to an average 6 foot tall person, Bezos would be ~1300 miles tall; in space altitude from earth, that would be geospatial orbit
I guessed all of these values, I might do the actual math at some point, but not right now.