Another thought that hasn't been mentioned until now. For the Americans on this board, GB & I are foreign countries (stating the obvious) while Bandon, isolated and cool as it is, is just another address in the good old US of A.
So--for the adventurous among us, the different currency, idioms, accents, roads, pubs, stores, people, etc, can be a big draw. The golf is fantastic at any of these locales, but it's the "out of your own comfort zone" aspect of GB & I that adds a certain flair to a a trip overseas.