I think there might be some people interested in a 25K machine, but only if it really improves their workflow; don't think adding more money / processing power does much for most people, maybe for 3d rendering but they have specialized hardware for that, which gives them more raw bang for their bucks than Apple could do.

I'm wondering if it'd be viable to have a 'compute unit' shared by multiple users. i/o would probably be a bottleneck, so maybe have it link up macs via usb-c? It might help with e.g. compile times (which last time I did iOS development, two years ago, was kinda slow (>1 minute for our app, CPU bound)).

But that's probably too specialized a thing. Apple wants to sell units by the million, not the hundreds (if that). Which is why they discontinued the mac pro and the 17 inch MBP.