Impossible Medal?

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Hi there,
The medal "Gargantuan Spender" seems to be quite impossible to win, since there seems to be no plausible way to earn 20000 gold at the moment. Could you perhaps add more ways of earning gold? I have heard a suggestion before to add a Non-Player Character who would be able to buy items from the players for a few gold pieces. This would make it easier to earn 20K.
Thanks!