I think Marc they know what the taxes and airfares are, so can adjust that part and charge the 100% on the cruise portion, plus add the taxes once and airfare once. Not sure on that, but many cruise lines do charge 100% single supplement, some don't, and in some cases it depends on the cabin category you want. Not justifying it in any way, as I personally think that is a lot and tends to discourage singles from traveling -- just adding my two cents worth about the taxes and such.
