Out of all the product's in Apple's lineup, the Mac Pro is probably the one with the smallest price differential relative to competitors' products. Go ahead and spec out a similar workstation from Dell or HP: you won't see much difference in price.

Base price doesn't really matter to the buyers of these machines anyway, they're not consumer products. These are being used by professionals who generate revenue way in excess of what the computer costs, and stuff like enterprise support contracts (where you can have a replacement machine at your desk ASAP if yours dies, because otherwise you're losing money by the second) matters much more to them.

The articles you linked are just dumb clickbait using the logic of consumer product pricing where it isn't applicable.