Come on now, Appleton actually produces some fine world-class rums; never seen them referred to as "low-ball" before.
http://en.wikipedia.org/wiki/Appleton_Estate
But to each their own.

Cayman has close to a 50% duty on spirits imported from anywhere (incl. Jamaica), which is why you encounter such high prices on island.

Snorkel air just tastes better than canned air...