Well, you guys bring up a hypothetical point that has not been validated to any large extent in the world yet. I think all we have to do is look at the current examples already out there. Tons of herps enjoy legal protection and captive breeding efforts yet still are relentelessly poached. Dart frogs, rosy boas, kingsnakes, hellbenders, bog turtles...on and on and on. Time has proven again and again, the worst thing you can do for an animal (which has no value other than pet value) is attach a large price tag. Newts and salamanders have been relatively safe from this so far (except Cryptobranchids) due to limited pet interest, but that is beginning to change.
The bottom line is this: If an animal is going to fetch you 600$, why spend several years and several hundred dollars trying to breed and raise them when you can snag 100+ adults in a night?
These aren't the first newts or salamanders offered here for large amounts of money. There have been lots of Triturus, Salamandra, Tylototriton, P. poireti, Bolitoglossa, hellbenders, Neurergus, etc. sold here in the states. So where's all the captive breeding results from those high prices? Where is their impact on the wc pet trade? I sure haven't seen it.