You would need a permit to have it, too. On top of the $5000 price tag. Absolutely magnificent animal but, I'd rather spend that kind of money elsewhere.
Those interested in this topic please feel free to visit my thread on them.
http://reefcentral.com/forums/showthread.php?t=1785467
-WWCC
So then I guess that can be considered depleting their natural population since that male did not get to release his offspring into the wild. They may not be actually taking individuals directly from the ocean, but it definitely takes away from the reproductive potential and limits the next generation.