Hey Steve,
So what prompted this thread title, or are you just trolling? You need to read section five of my book, "Advanced Marine Aquarium Techniques". It discusses ethics and aquariums. There is also a section on public aquariums that might be help enlighten you as well.
Public aquariums are not a "huge fish buying sector" - at least the good ones aren't - we buy fish and keep 'em alive, so very little repeat business for folks like you.
I'm just finishing up with an interesting study - I received a shipment of "pet store" quality fish and inverts that had been confiscated by USFWS when it was attempted to export it to Canada improperly. It contained 80 specimens, a random assortment - mostly stuff I know better than to order. Just days before, I brought in two other shipments consisting of 35 animals I had selected myself off 104 street stocklists. Some were MAC, other fish from good origins, species known to thrive, etc.
In a nutshell - 51% of the "pet store" quality animals died within the first 60 days. 12% of the fish I picked out died during the same time, in the same quarantine systems. The difference? A public aquarist selected the fish that mostly lived, and a pet store employee ordered the ones that mostly died..... I'd say it is the pet stores that are the status quo here - The pet store fish in this shipment were the same ones that I see over and over again in every LFS in this area: Cleaner wrasse, tiny Centropyge, Harlequin sweetlips, tiny damsels, skinny tangs, flame scallops, wild caught clowns with Brook, it is disgusting.
Jay Hemdal