In real estate it is location, location, location (or at least it used to be). In bottles, coins, stamps etc. it is rarity, condition and demand. The Guerlain bottle in the article may be a sole survivor or at least one of a very few, and would be in great demand by fragrance bottle collectors. I would bet a contemporary bottle of Charlie or the like has a few tens of thousands of similar bottles available nationally in closets, bathrooms and flea market stalls, and will continue to do so in slowly declining numbers for many, many decades in the future.