I would guess that you were the only blade pilgrim you saw when there. Correct? That could be why - not too many people pop around into the shop/public displays. First, these days Sakai is just a conventional suburban district with little for visitors and, second, partly because of this few people come round and walk into the knife destinations.
For example, I've been to the Hamono Museum - twice - the only other visitors I saw were tour groups of middle-aged folk, mostly women, doing a mandatory stop in the ground floor for non-knife souvenirs. The knife shop upstairs (big variety of stuff to buy) is basically a sleepy loft, and my impression is if a visitor arrives it'll be one of the highlights of the day.
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To reference another thread where seeking out and visiting the makers was discouraged by a rather prominent member, seems to me that there could be a lot more to do in these places. In the Hamono Museum there is no one to talk to to tell you of places to visit, no knife geeks at all. The actual hamono stuff is even hidden up in the upstairs floor. In Sakai or Kyoto, where there are loads of people still involved in the trade, there are no tours or mentions in the tourism lit. In Kyoto you're told to go to Aritsugu in Nishiki and that's it. I wonder but doubt if it's different in Seki or Sanjo.
Blacksmiths and bladesmiths might not be used to or trained to deal with visitors, especially foreign, but seems that more could be done to promote these traditional crafts and industries in Japan. (Lots is done for other industries in contrast.)
Anyway, sorry. My feeling was that there are few visitors to the SY shop, and so stocking the shelves wasn't a priority. I think there's an office in the back, and the paperwork and sales there are probably what the guy there works on. (Met him, he's the owner.)