One of the really kewel things about "sinker" logs and the lumber made from them is that a good portion of it is very old growth timber that is just unavailable anymore from growing forests. The tight grain is very different from "contemporary" trees and it highly prized. That can account for a good portion of the premium price that this material garners. I haven't personally acquired and used any to-date, but I do hope to have that opportunity at some point.
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The most expensive tool is the one you buy "cheaply" and often...