At least one of the “high priced sellers” is a very reputable brass dealer whose primary business is consignment sales of typically higher end brass models. These are the very models that others outside the United States will typically spend a lot of money for. Also, the dealer has a financial incentive to get the most he possibly can for his clients, as his fee is then also larger. The clients are often not in a hurry to sell today; they are “maximizing their investment”.
One of the aspects here is that the descendants of the Japanese brass builders want to obtain and collect fine examples of their parents’ or grandparents’ modelmaking. Somewhat unlike some of the production in South Korea, the Japanese always took great pride in the models they made, getting together weekly with fellow builders to show off their art. So the descendants are willing to pay big bucks for premium models, which has also crossed over into the same or other international customers paying big bucks for the better Korean stuff, too.
So when you see the high minimum bid prices on certain rare or higher end brass, you need to realize that price is based on the international market for HO brass, where some customers still have American prototypes on a relative pedestal, along with Elvis, genuine American muscle cars, etc. etc.
According to one semi-retired brass dealer on these forums, for items above about $1200 in value, 90% of the HO brass sales on forums like Ebay are models moving from the U.S. to international clients.
John