I understand your logic check out these links in regards to shipping inceidents and annual revenue touristic and fishing from the GBRT Vs Commercial exports
The reef is way more profitalbe then shipping exports, its just a case of having the cake and eating it to.
http://www.gbrmpa.gov.au/corp_site/i...es_and_threats
http://www.gbrmpa.gov.au/corp_site/i...dates/shipping
http://www.climateshifts.org/?p=2549