What's the reason for that? Is their iron and steel cheaper than wood? No way.For all we know, swords were expansive in our reality, we don't know if that's true for Calradia. Considering the number of them around, probably not, that's not really a valid argument.
Is it, for some reason, harder for them to forge a spearhead or axe than a sword blade? Not true again, we have crafting system and you actually need higher skill and more materials to make a sword. May be it’s easier to use sword than spear, axe or club? No, it isn’t, it’s actually harder: you can’t really screw up a thrust with spear or botch a whack with mace, and even though you need to keep edge aligned with axes, axe is more forgiving in a cut because it cuts so much better. Are swords easier to maintain or repair? You have a long blade with one or two edges, it’s much longer than spearhead or axe, if your hilt gets loose it’s much harder to fix than replace a shaft, and more metal area means rust is a bigger problem. For all intents and purposes, Calradian swords should be more expensive than spears and axes. Not only that, they also should be used less because training a half-decent spearman takes as much time as training really mediocre swordsman. Especially if you prohibit shields and they have to learn how to parry. Believe it or not, fencing wasn’t really a common thing in the Middle Ages. Granted, they might have that knowledge more or less accessible in Calradia, but it’s still harder to use anyway. In essence, sword is a weapon which is more of a skill amplifier. It doesn’t really work well for a total noob, unlike spears and other weapons. Making sword the worst choice for a fresh recruit.