It was sort of a rhetorical question...
The equipment to stamp or laser cut washers is not a common toolset found in most people's garages. If I need a washer, I go out and purchase it. Washers are surprising inexpensive. Making them can be done, but most people I know would just go to Amazon and purchase the correct size. But some do in fact purchase the same washers for $50/ea from a vender as long as they have an NSN stamped on the package. Because mil-spec washers are super better...
I know it was rhetorical, but it just shows why you're having such a hard time understanding/accepting the pricing. You're still mentally comparing it to a washer you buy at Home Depot for $0.50. That's fine if it is a similar size, or common size. But in a lot of these assemblies, just because it looks like a washer doesn't mean you can actually find a $0.50 washer to the job, it may take a $5-10 custom laser cut part just to fit the same way.
Mil-spec washers have reasons they cost a lot. Material traceability, strict specifications for alloy composition and coatings, quality control requirements, destructive strength testing, and even military standards on how they have to stamp part numbers on them and the ink they can use. It all costs money, and they are absolutely "super better" because you can guarantee exactly what you're going to get. It's ok to say you don't need those things, but naive to say (or not be clear to others who are reading) about the differences. I have to cite all these standards onto all my design drawings, all the way down to
NAS 850 which tells the manufacturer exactly what kind of plastic bag they have to use to package it.
Those custom laser cut washers in the kit above are already a "cheap" alternative to the mil-spec one. They make a lot of the actual mil-spec ones though, so there are economy of scale savings.