By the way, to answer the question posed ("why would a distillery ever sell off their casks?") here are the reasons I came up with, in no particular order:
- convenient way to liquidate barrels that don't meet brand profiles
- frees up valuable warehouse space
- immediate realization of profits (bird in the hand vs. two in the bush)
- eliminates cost of handling/bottling
- hedge against future oversupply
It also occurs to me that there may be tax benefits to selling off new make or partially aged product rather than fully aging it on premises (maybe someone in the know can clarify?). The other thing that he doesn't touch on at all is the difference between bulk sales and contract distillation.
There might be other reasons why a distillery might sell off stocks. Anyone have any others?