estreeter: To answer your question simply.... no. I would not spend that much (assuming I could afford it, which I certainly can't!). Not when gear that comes so close in sound costs so little in comparison.
If I was an oil baron, Saudi prince, or some James Bond villain type of rich guy, then maybe I would. But first I'd have to have a specially designed listening room with brilliant acoustics. Anything short of that just doesn't make sense to me. What sort of speakers are you possibly going to run that would make your excellent DAC the bottleneck? I'm thinking of the Anedio, Violectric, Weiss, Antelope, Resonessence, and those type of ultra-high performers that still go for under $5k. In my mind any improvement would only be in your mind, chiefly caused by the need to justify your purchase. But many folks out there would disagree with me.
As bobeau as an example of - not every DAC is a good match for every set of ears, no matter how good it might be. But the great part is that there are so many options with prices in the low 4 digit range.