IIRC the origin of the odd pricing/weights of coins is in trying to make encumbrance matter. Nobody uses encumbrance rules anymore so you can just ignore the weights.
I don't play D&D but in my home fantasy GURPS games we run 250 coins to the pound, 1:10:100 value for copper/silver/gold. With the alternate prices in GURPS, this makes gold feel really valuable; eg a greatsword would be 8gp, and a full set of heavy plate around 120gp, while a big gold ring that weighs 1/4lb is worth around 90gp.
IIRC the origin of the odd pricing/weights of coins is in trying to make encumbrance matter. Nobody uses encumbrance rules anymore so you can just ignore the weights.
I don't play D&D but in my home fantasy GURPS games we run 250 coins to the pound, 1:10:100 value for copper/silver/gold. With the alternate prices in GURPS, this makes gold feel really valuable; eg a greatsword would be 8gp, and a full set of heavy plate around 120gp, while a big gold ring that weighs 1/4lb is worth around 90gp.
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Clearly the default D&D setting is under the sway of extremely powerful guilds that upcharge like a motherfucker.