Iirc, Abu Gadu said he's doing his jobs over 3k years and if i theorize that Sev aka "The Old King" lived around 1k years created with magic the infinite gold bag, then, after his passing, the Nevernuff Family spends gold as there wasn't tomorrow, flooding the market around the kingdom or perhaps around the world... Just think about it... There's a precedent in our history,
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that create inflation in nearly all Europe as consequence for America's discovery by Columbus last around one century, just think in a Royal Family with a fucking infinite gold bag to finance anything imaginable... It would be so much gold, that eventually you'll never wanted it, so much that you'll never worry again about prices. Iirc, in the market of the Old Capital there is in anywhere a price published, even in the brothel no one ask for silver nor gold, i don't know how exactly ppl are paid for a work more than a favor, but, if we think in our history, it is possible that salt as in the Roman Empire could be used or even paper money as in Antique China. Another hint that maybe gold could lose all it's value in that world could be seen in Jebediah, he later in the Rose Story was willing to pay her, without asking how much for his treatment, less Rose to make publicly the cost of her goods. Another hint could be iirc could be Myrtle, she never ask for gold nor silver for his goods to all of her clients, her husband paid his taxes with his work as woodcutter. So, Abu Gadu could have been all that time asking for gold when the whole world economy just crash down in a spiral to never rise up again as before, and as a character that doesn't go around too much, he still thinks that everybody wants gold for sure. Abu Gadu itself could have the same medievalist thought about gold, to have it in treasury or to spend it in luxury, as the prevailing economic thought of that time the capital, having savings to make investment wasn't common and in many cases punished.