> Now they cost a lot because brands spend a lot on advertising and use tricks to limit supply, and what the buyer gets in return is an expensive status symbol.
Sounds a hell of a lot like the diamond industry. Also, the top fashion houses, but both industries are taking a drubbing from artificial competition (artificial diamonds, and knockoffs, of various stripes).
I'm a believer in branding. I worked for many years, for a company with a "top-shelf" brand, and saw what it took, to maintain. But it takes a huge amount of discipline and "silly" stuff. Brand damage can come from a million different directions. I have found very few people are willing to do what it takes to maintain a top brand.
For quite a while, there have been "brand-only" products, like Von Dutch, or Life Is Good™. They are the two-dollar hat, with the twenty-dollar logo. Like Izod Lacoste or Members Only, in the last century.
How do "big brands" deal with efforts pretty clearly (but deniably) aimed at sabotaging their brand? Besides the ebay approach.