Hi,
Discussing art about weapons is not a single matter, but, some Japanese weapons became artworks. There were some millions swords which were forged during nihonto history. Mostly are purchased by low-average samourai class; some are by daimyo. Are they same blades, made by the same smiths? had they the same purpose? I don't think so. Many are used on battlefield, others became treasures.
As well, When Napoleon wanted a portrait, who made it? Delacroix or "Tartempion Duchnock" (well known for his bad-painting).
Swordsmith are classified in accordance with their savoir-faire and their skill. There are smiths who made weapons and their are who made artworks.
In every times, the best are the more desired and few can afford their work. that is true for all artistic crafts.