Supposing you're a wealthy woodworker, would you consider paying US$9000 or US$7500 for a Japanese natural stone? While browsing on Ebay I noticed two offerings for "Junma Masamoto Motoyama Zhongshan Special Satin Pattern" and a "Pure Shinsei Motoyama Board Zhongshan", I'm not sure if these are real prices that people will pay for, I found a site were some jnats go for $3k. Perhaps there is a special kind of satisfaction sharpening tools on these stones, similar to that of planing with a £10k new infill hand plane, or driving a US$180k Mercedes. It's a goofy world.
Rafael
(Am I allowed to post screen shots of Ebay? I'll remove them if they are not kosher)
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