Frinstance I'm guessing that the majority of the watches made by certain well-marketed and expensive watch manufacturers (I shan't name any names lest someone glance at their own wrist and feel the need to make an impassioned defence) are bought by people who really can't afford to spend that much on a watch. On the other hand, there are watches in the same price range which are probably only getting bought by people who can afford them, and most of 'em are probably brands that most people have never even heard of.
That book really made me evaluate what I am spending money on.
But the whole thing is seriously flawed, because all his statistics are based only on the small fraction of millionaires whom he actually interviewed, who are surely not a random sampling of all millionaires.
Not that I would ever buy a Rolex. Suunto's [1] are more my speed and are like having a mini-weather computer on your wrist (altimeter, barometer, compass). They are not $15 casio cheap, but way cheaper than anything like a Tag or Rolex and actually useful for my mountain climbing :)
[1] www.suunto.com http://www.amazon.com/Suunto-Observer-Wrist-Top-Altimeter-Ba...
Most popular watch brands among HH inc >$100k are Timex, Fossil and Casio but the brands most disproportionately bought by these people, of the 17 brands in the survey, are Tag Heuer (51% of Tags are bought by $100k+), Movado and Swatch. Rolex comes in at #4