I am having a problem leaving this one alone. A diver dying in Hawaii has nothing to do with the "high" cost of Marine fish.
A huge amount of Marine fish are collected in third world countries with incredibly low overhead, they sell their collection to the local wholesalers. These wholesalers warehouse these fish for a period and then export them by air. Air freight for live tropical fish is VERY high. On top of this is a charge for the packing materials, permits, fuel surcharge and various others. These fish are then shipped to an overseas wholesaler or in some cases direct to the retailer or through a transhipper.
This may seem like a lot of handling unnecessarily but logistically no other way is possible.
Other countries can ship more directly cutting back on some of the handling along the way. Those countries have much higher overhead then the others because of the individual economies, currency value, etc. Also the more distant or isolated collection area, the higher the freight incurred.
For myself in Vanuatu, we have advanced systems, our divers are higher paid and our overhead is higher due to the dollar value locally etc.
We survive because of the quality of our livestock and the unique fish we collect.
In my opinion marine fish are being sold far cheaper than they should be. The risk in collection is high, particularly in the developing countries. Maybe if divers were not pushed to collect more and more because of the low prices offered to them there would not be as many mortalities. Incidentally, the majority of divers in the Philippines and Indonesia are independent. They collect for themselves and sell to the wholesaler. If they focused on quality and were paid more for their fish, they would not have to dive as much or as aggressively to earn the same money. Unfortunately I don't think this will ever change as there are too many wholesalers etc. trying to be the cheapest.
Many importers in Europe are actually taking a stand and ordering less from areas like these and focusing more on quality and promoting that to support the higher price they have to pay. From what I have seen personally it is working in some areas. Other areas are too fixed on low prices to make a positive change.
Is your purchase of a marine fish really a good deal if it's organs are destroyed by the poison it was caught with? How about if the collector died? Good deal? These are the things hobbyists don't hear about. Maybe not even the store owners.
There are times when I want to scream at a few customers who will compare our fish to another store whom I know are a far inferior quality of fish. Unfortunately I know it will likely fall on deaf ears as to those customers, a coral beauty is a coral beauty, no matter where it comes from.
There, I feel a little better.

Sort of.