Pretty much like everyone has said, limited collection areas, huge shipping risks and cost and somewhat rare in the wild, plus then you add on cost so that the people doing this can make money. Its not surprising that they cost as much as they do. I am sure you could turn it into a profitable company but you would operate on thin margins and the loss of one fish could take you out of the game. Also you have to consider the fact that few people are going to be willing to drop that kind of cash on a fish, so this limits your market by a lot.
I was wondering how many posts it was going to take for somebody to make note of the fact that the addressable market for any $3K fish is vanishingly small. I know very little about how rare the Gem may or may not be, or the vagaries of exporting livestock from that part of the world, but that there has not been a rush to 'exploit' suggest that the economics are in fact not all that appealing.