Is the market for high end watches unique? I suspect that the current demand for watches is similar to the demand for fine art, wine and other luxury goods. Some factors:
Growing market: The marketing power of the manufacturers and retailers and sites like this are growing the interest in high end watches. I suspect the same for other luxury goods.
Secondary Markets: The growth of the secondary market for the trading of luxury goods is creating additional liquidity that did not exist several years ago.
New Wealth : The demand for all classes of luxury goods has increased dramatically with the increase in newly wealthy markets in Asia, Russia, India and elsewhere. The demographic seems (anecdotal) younger, better informed with a strong aspiration to attain luxury goods and services.
It would be interesting to index a bundle of luxury goods from several exclusive areas: Wine, Contemporary Art and Watches for example, and measure price and volume over a period of time. I suspect that the markets would move in a similar pattern.
Best,
Fathom V