I work directly with factories overseas & domestic and there is a big difference in cost depending on quality. The 0562cf blade finish alone increases prices zt has to pay. Steel prices are going up, especially with demand, not just from the knife world. If you want tighter tolerance and less variance the cost increase is not linear, it can be exponential. This is a broad example, getting a cast metal part that has a tolerance of +/- 1mm might cost you $5/pcs, getting something to +/-.25mm might cost you $25/pcs.
People confuse cost of raw goods with cost of engineering (NRE). To achieve tighter tolerance, you have to use better machines, have better tooling & increase quality processes. Tooling costs are very high on moderately toleranced parts, if you want tighter tolerances you might have to pay for a better tool designer, better tooling material (ss, copper, etc vs aluminum or quick tools). For comparison, if I wanted to do plastic injection molding and wanted only a few hundred pieces I would choose a quick aluminum tool that only last a few thousand shots ~few thousand, a s.s. tool would be tens of thousands.
So, its not just cost of raw material, its the increase in engineering, processes, tools & labor that more than justify the price ZT has put into a knife. Even consistent grinding and heat treat drastically reduces cost. As tolerances tighten your scrap & reject parts go up, the factory does not eat these cost, they roll it into the ppc.
Now, if you feel as though you don't care about fit and finish and only care about the blade, that is another thing. From a collector and engineering side ZT's prices are more than justified. That's why handmade perfectly fitted customs cost so much. Anyone that wants to compare a CRKT flipper to my RJ Martin Q36 or even my ZT 0562cf is more than welcomed to their opinion, mine is that there is no comparison.
*also the 0562 is sharp as hell. I am very careful closing it as I like my thumb. Its as sharp as any knife I have.