True - but put your 84s up against the 184s..... Which do you love ?
Neumann still make good mics' but they've hiked the price because they can. I say again - the U87ai is not an £1800 mic'!!
Ah well, I only have old U87s, none of this new fangled "ai" nonsense!
In truth, I think you are right, there is some premium loaded into most of the product range to reflect the brand's reputation. But they do hold second hand values pretty well, and they will service/restore old things that other manufacturers would give you a strange look about (I've had AKG tell me they can't supply a part for an old D25 - lovely mic - which I wanted to install myself).
The acid test is, do you think Sennheiser (same company as Neumann, different label) are also overpriced? I'd say mostly not, though the MKH range seem expensive for what they are...
Dynamite with a laser beam...