As long as I remember I was able to get the same horsepower for a lower price if I would've moved to windows.
...but in the last few years that price gap has been increasing and/or gaps are opening up in the range that force people to buy more "horsepower" than they need. They're really testing how much Mac devotees can be persuaded to pay before they switch to Windows or Linux - and not doing anything to attract new users to Mac.
We don't yet really know (a) what sort of "horsepower" will be available on the PC market for $6000 when the newly announced Xeon Ws + matching motherboards (with those extra PCIe lanes) start to feature, or (b) what Apple will charge for CPU/SD upgrades and what the premium is going to be for MPX modules over plain PCIe.
The old MacPros
weren't particularly over-priced like-for-like (even the trashcan if you thought external expansion and dual GPU was a good idea) - the MP 1.1 was actually something of a bargain (pity it was abandoned so quickly). What Apple have done now is pre-announced a machine based on brand-new Intel and AMD technology (but not, so much, anything exclusive to Apple) which is difficult to price-match against hardware available today. What we
can say is that the entry price for an expandable, headless desktop Mac has doubled.
Isn't it a good thing that people have a choice?
The problem is that many now
don't. Apple just hammered the final nail in the coffin of the $3000 Mac Pro, completely removing the
choice of people who just wanted 1-2 full-size GPUs and a couple of specialised i/o cards, who just wanted a replacement Mac Pro with an up-to-date CPU/GPU. Then, at the other end of the spectrum, there's the choice of Xeon systems with multiple CPUs that can run
10 graphics cards for GPU-based computing, proper rack-mount systems with redundant PSUs, blade servers etc. for render farms...
If the new Mac Pro happens to meet your need then maybe you are the 'niche' in the title of this thread.