I assumed every point of ATK is 100 coins, and Weapon Speed is 50 coins/point. That matches the costs for swords, axes, and spears. Prices for weapons with higher & lower ATK bonuses vary from that since damage range on a hit isn't linear but based on comparing ATK & DEF. The large shield is same stats as chain, so same price.maybe i need to tell someone about something.
(Historically shields were cheaper than armor, but were expected to get damaged/busted and need replacement on the regular, which PQ ignores. )