There are only a few who are in the manufacturing end of the supply chain, some with suppliers from the Far East, some European, a few American. Many resellers (most of those we deal with) buy in quantity from these suppliers at wholesale prices. Exotic blanks, for example, the splits the difference keeping their margins where they need them while trying to lower the mark-up to us. This, a lot of people re-sell PSI stuff.
Some get enough hold to make modified versions of the originals. Some make different quality copy cats that look the same on the outside. They may actually have a different quality of plating, different quality of internals, or different thickness of parts. This goes both directions with some better, some worst and some mixed.
At the end of the day, if you have a favorite kit, buy from a couple of different suppliers and see how they compare vs cost difference.
The "web of things" can be deceiving. I have bought the Big Ben antique brass version of a cigar from Exotic Blanks and one from WoodTurningz. Neither kit is a bad kit, but there are huge differences. Both are antique brass. One is the color of yellowed brass similar to a shell casing. The other is antiques in the style of 1970-80's cheap furniture hardware with black antiquing over a brass color and under the epoxy coat. One has a lot of plastic in the transmission, the other is is nearly all metal. One has thinner thread walls than the other. One is more expensive that the other. At the end of it, I prefer the Exotic Blanks kit even though it was slightly more expensive, it was overall better made. However, 6 months later the thick baked on black accents of the WoodTurningz kit are more intact than the Exotic Blanks kit. The WT epoxy overcoat shows poorly on all surfaces where the EB kit, though scratched the same amount, looks better with the true brass color underneath.
Not sure there is a right answer, just what meets your needs.
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