I think that they looked for all anchorages where there was nothing ashore to "tempt" boats to break quarantine. I agree that most of them are not good anchorages (although I haven't anchored at 3,4 or 5) and the only one I'd plan on would be 9 or 14. And I think I've had trouble getting good holding at 14 with my extra oversized anchor and over 300ft of chain! As you mentioned, most charterers have enough trouble picking up a mooring ball and are not comfortable anchoring. I think that this is another case of the "BVILove" false advertising attempt to lure in tourists.