You can see it also in the auctions of vintage cars. Models that were not overly popular weren't being bought or sold. (Think Alfa Romeo.) Then as other makes (think Porsche) prices went up, the less popular Alfas became more attractive...and when combined with the economic storm warnings, that has evolved into both a selling and feeding frenzy. Comparing the prices of Rolexes and Omegas, it is obvious in today's market that Omega offers greater value for the money. More getting bought equals more being sold.