Cash flow and turnover are key to any successful business, but some business owners are more hoarders than business-savvy.
Businessman One holds out to get top dollar for his item, and the overpriced item sits for 5 years (or, for some of these items, 10 or 15 years) before he finally finds the right buyer seeking that exact thing and willing to pay all he is asking.
Businessman Two guy prices it reasonably and moves it within six months, his markup is only half of Businessman One. Who comes out ahead?
Businessman One thinks he did twice as well, and that patience is the key to his success. But he does not understand the opportunity costs. His capital has been tied up for years and paid no current income or interest. It has also tied up a portion of the store, so there is a positive cost associated with holding this item; a portion of the rent, utilities, labor to man the store -- some small share of all of these costs are associated with this shelf space, so if one were to truly account for all costs, there is a negative cash flow each month and each year for the unsold inventory.
Businessman Two used his markup, though lower, to cover a share of his rent, utilities, and to pay himself an income; upon his sale, he used his returned capital to buy another engine, and used that same shelf space to show the second engine; sold it within 6 months; and repeated the process 10 times altogether in five years. For the same original investment, his cumulative markup is thus ten times Businessman One's markup, and he had ongoing income that he could have used to pay himself; or to cover his overhead; or to invest in more goods to sell, to grow the business.
So when you see the same dusty, overpriced NOS items in a store, feel sorry for the shop owner, because he doesn't understand business. The problem is not the merchandise, but the price.
Those same NOS items, priced reasonably, will sell and be enjoyed by someone who either does not have $1,000 to spend on a new engine, and would otherwise be priced out of the hobby; or by someone who does have the money, but would rather spend a fraction of the money on something a few years old, or even a few decades old, enjoy it well, and enjoy it all the more because he put the difference in his kid's or grandkid's college fund.
David