Talking strictly on peninsular weaponry, the amount of iron ore necessary to produce a sword would be relatively large as the efficiency of the smelting process was low, resulting in a small quantity of usable iron. Further, the quality of the metal was not always the best, most not usable for weapons as complex to make as swords [not unless you didn't want a good sword anyway, which was definitely not the case in this particular location I'm talking about].
On the process of actually forging the sword, you needed a swordsmith to do the thing, not your everyday blacksmith that produced the agricultural implements for the communities [and that could easily make a mediocre spear or a javelin head]. It is a complex fabrication technique that requires a specialized forge and set of skills that was simply not available everywhere. Time was also a factor, since it is a time consuming process, especially when talking about those that weren't mass-produced. Time is, and was, money.
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