When I treat myself to an expensive bottle as a treat, I go against conventional wisdom and use it at least once to make my favourite cocktails. While I agree that a simple bottle is best suited for cocktails, I can't remember an expensive base liquor ever spoiling a cocktail. For some, this is a waste because the premium taste takes a back seat to the cocktails, but often the result is better due to the subtle flavour profile of higher-quality spirits.