Thanks all. Maybe I need to refine the question a bit.
If you (personally) have purchased and sold a sword, I'll assume that you sold it for a higher amount. Percentage wise, what was the increase, and how long did you own it? Has anyone ever seen any metrics on the nihonto market over a given period?
Instead of having the "Van Gogh vs. Nihonto" discussion, we should combine the two. Witness the birth of a new art form "Van Gonto" (see attachment) - he did slice off his own ear with something & I'm betting it was with a katana. The first $2 million bid walks away with this lovely piece of history.
I'm already investing in real estate, stocks, and wine. I've always been interested in nihonto and am curious about valuations. I'm also curious about the "food chain" of the market. Where do the dealers get their blades? Directly from the public, or are there wholesale vendors for the dealers?
By the way, I went ahead and bought the waki.