One reasons I have the ocellaris (and the same arguments would apply to percula) in the first place is that clowns are available tank raised. No worries about cyanide, killing fish in shipping, and so on. The fish are already adapted to aquarium life. Plus, I think it's a good idea to support captive breeding efforts. If they can sell clowns, then maybe they'll be able to put effort into other species.
One thing I have noticed with CB fish, though, is that you have to be a little more careful about abnormalities. Mis-bars are common, but some would argue that mis-bars are cool. Certainly doesn't hurt the fish. My guys have slightly uneven mouths.