In the Single Barrel thread, the question was asked "how can they make any money selling this stuff?" I can assure you that they do. This may provide some insights.
Corn closed on the Chicago Board of Trade yesterday at just under $2.50 a bushel, where it has been stuck for some time. Wheat closed at just under $4.00 a bushel. Rye and malted barley aren't traded at the CBOT, but let's assume they're $4+ a bushel. Since bourbon is mostly corn, let's arbitrarily say the cost of bourbon grain is $3.00 a bushel. In a typical modern distillery, one bushel of grain yields 4.5 to 5 gallons of entry proof whiskey. Considering lower proof at sale and loss through evaporation, the yield in sellable whiskey is at the low end of that scale, let's say 4.5 gallons. That means the cost of the primary raw material for making whiskey is about 66 cents per gallon.
Bottom line. The grain cost in a bottle of whiskey (any bottle of whiskey) is about 13 cents.
When your raw materials cost next to nothing, you can spend a lot adding value (i.e., labor) and still make plenty of profit.
The other big factor in the retail cost of whiskey and all other distilled spirits is taxes. The Distilled Spirits Institute estimates that 51 percent of the retail price of a bottle of any distilled spirits product represents taxes.