From my interpretation the seller is an enthusiast/collector and not a dealer, although I understand there could be some blurring of those lines. Not sure a dealer would be so accommodating, unless there was a prior agreement, so your point stands.
I will be attending the 3 day Japan Art Expo in Utrecht next month. I hope to learn a lot at my first Nihonto show and make some useful contacts. In 2 weeks I'll be visiting an important German dealer and looking at some of his inventory firsthand. As already mentioned nothing beats having the sword in hand to fully appreciate the finer detail and craftsmanship of both the forging and polish. This is all in preparation for making my first big Koto sword purchase.