@Archomp The relevant dialog
"It already has such a high value, but when a user with advance blacksmithing skills shows up? The price would increase by hundreds, maybe thousands, of times."
Right now the price is high due to speculation, but an item is only worth what someone will pay for it. If the ONE person who can use the item refuses to pay the crazy price, it'll only have its speculative value. And once a few people are willing to come down on it's speculative price, it's value will collapse.
But after reconsidering I can see how it might be the other way. There's too little info on the market to accurately say. And apparently people in this world are willing to dump thousands of dollars (US$) on in games items, so who knows.