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Ok Mr. Brilliant, please show me where there is any documentation showing that clicking the "rarity" sort button will sort by the number of stacks. AFAICF this is not documented anywhere on Blizzard's websites, its not in WowWikki, and it certainly isn't intuitive.
And are you sure it even works?
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Here is what the Silvermoon SW AH looks like atm:
http://imgur.com/a/BIf1N