Your analogy fails.. on many levels.
1) I can create a whole lot more than a primitive lathe. You would be surprised what you can make out of coils of copper wire, and know-how.
2) Cherry trees, like other fruit trees, and especially members of the prunus genus, can and often are propagated by cuttings. Further, a tree propagated by cuttings is able to bear fruit much faster than one produced from seed. (the quality of the fruit is significantly more consistent as well.) Your typical fruit tree takes 5 years to become old enough to flower. A tree propagated from a cutting however, will attempt to flower before it even has grown roots! With good care, it can produce a small number of cherries in just a single year.
A good, healthy cherry tree can theoretically produce hundreds of such divisions, leaving the trunk to the carpenter. (he does not care about the twigs anyway.)
What I was referring to in my post, however, is that your typical CNC machine costs upwards of a million dollars for a small one. (assuming it is a legit CNC machine, and not a converted conventional mill with cheap electronics.) That is because it has a LOT of engineering hours invested into its design, and its parts have to endure a toxic mix of high humidity, high heat, corrosiveness, and systemic neglect. (Businesses that buy them often try to drive them outside engineering tolerances, because "The machine can take it, and time is money. We gotta meet this order by tomorrow!" etc.) I very seriously doubt that what I could fashion from 1/10th of a 1.5 million dollar CNC machine would have a legitimate retail price of 150,000$.
But, thanks to the power of statistical averages, we dont really need to worry about that. CNC machines are at least partially price-inflated because of their specialist niche in manufacturing, the limited number of legitimate manufacturers, and other such market forces. (Case in point, for a prior employer who was seeking to upgrade their CNC fleet, the price they were given by pretty much everyone for a CMOS SRAM upgrade from 150kb to 2mb for the controller was going to be 3000$ per unit. I looked up the SRAM modules in question. They cost 25 cents each, and only needed 8 per system. Do the math there.) This means that the prices of CNC machines is not indicative of other physical goods in the marketplace-- Many are actually going to permit me to make significantly more than 1/10 the pricetag of the original item, on my product made from 1/10 of its constituent parts. If enough of these other goods exist in the market, we can totally make up for the lost equity, and become overall profitable.