From Eater, a very likely explanation. This will help me a lot when trying to explain to customers why we don’t have Blanton’s or buffalo trace on our shelves any more. http://www.eater.com/drinks/2015/12/29/10659946/extinct-whiskies-2015
The biggest reason that so many whiskeys have up and disappeared recently is a continued shift towards No Age Statement (NAS) bottles. This is, in almost all cases and despite what brands like to tell consumers, due to supply issues. There’s simply not enough aged stock on hand to produce that 8-year-old bourbon or 12-year-old Scotch today while ensuring there’s some left for tomorrow. Voila, age statements get removed, and longtime favorite whiskeys are gone forever.
Another example of allocation essentially annexing whiskey from the store shelf is Weller 12. Famously made from the same juice which supplies the Van Winkle line, it’s allocated to the point of year-round unavailability. “Almost everything interesting in bourbon is allocated and I’m lucky to get more than one bottle per year,” said Boudreau. “This includes almost everything by Buffalo Trace [which produces Van Winkle and Weller].”