if it was about the liquid then people were opening and drinking these bottles.. which is not the case otherwise they would realize that they can get more then 95% of that flavor on other bottlings which are a fraction of the price, and then these would never go for these amounts... lol cheers!
How many sister casks of that 263 cask must have been mixed with other whiskies into a cheap blend in those Nettie Harbinson days? Or, ¿what would have been the price of that whole cask if sold on those days? Questions to ponder over while sipping a good whisky. Slàinte!