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Your argument could be used any time someone asks about buying an oscilloscope, multimeter, or just about any other piece of test equipment. You can buy a cheap Chinese version and see if you want one.

The NanoVNA are supplied with a useless calibration kit, which does give people the illusion they are making decent measurements, when really they are not.

Your estimate of $3k-$10k is well off too.

The original poster should note that 4 N-N cables are needed to connect a test set to the VNA. You can make those up? yourself - they do NOT need to be phase matched, despite the original HP documentation saying they do. As long as the cables are stable, that's all that matters. The cable does not have to be anything special, as long as the screen is not so poor it leaks lots of RF.