What I don't understand, is how it wasn't immediately apparent this stuff was junk? You couldn't possibly think that it was equal in quality to much more expensive competitors. I guess it's just the case of not being real, until someone says it.
Diamonds, especially the recent craze around discolored ones might be a good comparison. They are valuable mostly because of years of shrewd marketing. If DeBeers started telling the truth, they could drop in value pretty quickly.
I had dealt with 'chocolate' diamonds for years, I currently have hundreds in my wood shop! My father works as a machinist, and brown, low-quality diamonds are their abrasive of choice for many jobs. They're (or rather, they were) super cheap because they were such low quality. I always swiped a handful when I visited him at work as a kid, because they made great pellets (they were exceptionally tiny and really hard) for my slingshot. I had a whole jug of them and just forgot about the things.
And now here we are.