These guys are right, it's all a money making venture to these buyers. The knives definitely aren't worth the secondary prices people pay for them except to buy bragging rights. They'll buy and then pull the rip cord when they see the market is about to fall. It's speculative gambling for most.
The companies keep that crap going because people keep screaming for the stuff like 12 year old girls at a Bieber concert and will pay exorbitant amounts for the product. The companies know they'll do it, too, so they charge much more than necessary knowing that flippers will buy them at any cost and then the screaming fan girls will snatch them up on the secondary market keeping the scheme going. It'd kind of sad, really, but to each their own. If I made a product and had a legion of screaming girls looking to buy what I made at any cost, I'd keep it going too.
The ZT 0600 is the finest knife I've held from ZT and it was really kind of a dud market wise. It still wasn't worth 400 bucks. Maybe 300 +/-. The 0454 was close but nowhere near worth 1500 or even the original asking price of 500. That was maybe a 300 or 350 dollar knife, at the most. Very, very fine production knives, but overpriced because of the rabid fans.
For whatever it's worth, I think the hysteria is dying. There hasn't really been anything truly breathtaking in the last year and people are getting sick of the limited edition game ZT is playing. They lowered the QC, materials, and craftsmanship while pumping up the whole hysterical fanbase crap and I think it was a bad strategic move for them.