Shipping methods over the past few years have increased to the extent that mortalities are less than 0.1%.
A lot of it depends on the experience of the packers and the importers to bring the fish around from the trip.
During shipping fish are exposed to total darkness, thus virtually shutting the metabolism down and causing the fish to "hibernate" due to the release of melatonin (laymans terms).
Bags have now been developed to consume ammonia and release oxygen further improving the quality of the water of the fish which are shipped.
What happens to the fish after it leaves the retailer is something we, as a trade, are working hard to police and it isn't easy.
But you are right, if we are ultimately thinking of the animal, we'll leave it in it's natural environment. But IMO there is a difference between what I do, and deliberately causing a fish physical pain purely for enjoyment.