I just don't see how Moog can keep bringing out Mono synths when they are no longer the game in town and people are bringing their own monos out at a fraction of Moog's cost. Can anyone really justify a $4000-$6000 mono synth anymore? What exactly is the selling point of that? Naw, it's time for Moog to stop loving off of it's name and show what they can bring to the table.
There are people that want at least one polyphonic analog synth in their setup, there are people that only use digital synths for polyphonic duties, there are people that would choose a Rompler as their only synth, there are people that are of the opinion you don't hear any difference in a mix anyway and that you can do everything with plug-ins, and there are people that prefer analog mono synths for sonic as well as haptic reasons and because it fits their musical needs and the way they arrange their music in which each synth represents one voice, just like in an orchestra or choir. So there's a market for everyone.
The Minimoog isn't cheap, but there were obviously enough buyers for it, despite all those mono synths that cost a fraction. So based on empirical facts and the actual demand, there is no reason to question the price policy. Moog didn't stop the production of the Minimoog because it didn't sell or people thought it was too expensive, but because it sold too quickly so they ran out of parts much quicker than projected. In Europe for example, the Minimoog costs about 3,899 Euros (tax included), which currently is the equivalent of $4,454. According to Thomann, it still sold well enough to make it up the seller charts next to the MS-20 mini, the Sub 37, and the DeepMind 12. And I would predict that it could have stayed there for a while, even with the Behringer D or the SE-02 on the market, as those two are simply no Minimoogs. Not for object fetish reasons, but because they don't quite sound the same and don't provide the same haptic experience that defines what makes the Minimoog a complete instrument all by itself. The Behringers and Roland boutiques are designed based on a consumerist approach, while instruments like the Minimoog have been designed with aspects in mind that make sense with regard to musicality and performability.
Plus: Choosing an instrument is not only guided by purely rational principles. No-one can fully objectify what makes a certain instrument "speak" to them. It either works or doesn't. Tech specs on a sheet alone or the question about what could technically be possible with another synth are not really aspects that say anything about whether one would find a particular instrument pleasing in terms of playability and sonic quality.