The tooling and electronics for one drone model is amortized across millions of consumer drones, and also shared with other consumer electronics. The tooling f

The tooling and electronics for one drone model is amortized across millions of consumer drones, and also shared with other consumer electronics. The tooling for an artillery shell is used only for artillery shells. Not many consumers looking to buy 152mm shell casings and high explosives. In the industrial age, volume production is the usual solution to keeping costs low. Artillery shells would be a lot cheaper if we built as many of them as we did in WW2. (As a side note, this is one reason why housing was so cheap in the post-WW2 1950-1970 era. There was a whole lot of surplus construction equipment leftover from WW2, so you could acquire the tooling needed to build a subdivision really cheaply. Once the surplus aged out and there was no economic reason to build a huge number of new diggers and bulldozers, construction got a lot more expensive.)