Because the flavor and quality of different types varies depending on the time of year, quality of season and grower, it helps if you can taste before you buy.
If it is that good of a liquor (or even wine), wouldnt that kind of quality evalate the flavor, appreciation and enjoyment of a drink just that much more BECAUSE it is such a fine distillate?
Cocktails created during this time had a general theme of trying to mask the flavor of the spirit, seeing as that what was available was not of great quality.