Ed, I'm not super worried about cycling through numerous fish for ecological or ethical reasons, if we're talking about fish that are reasonably low-priced, and as far as I know, plentiful. As far as I know, copperbands fit in that category. However, that said, I'm pretty much with you on the line of thinking that says "why buy 'em if lots of 'em mysteriously die," if for no other reason than I'd just prefer not have any of the fish in my care die. And for that reason, I doubt I'll get another copperband soon.
However, I am very much in favor of experienced, expert hobbyists such as Paul B (and many others) trying to keep difficult fish (or corals, for that matter), since I think that experimentation with various husbandry techniques, and the sharing of those techniques on places like Reef Central, is integral to the advancement of our hobby.