It seems like they’re maybe Apple-exclusive so it’s possibly they’re drastically marked up. The Titan RTX is $2500 apiece and seems somewhat comparable.
I think your issue may be with the exponential scaling of GPU cost at the highest end. As a consumer, you wish that a card ~2x the Titan in tflops only cost twice as much, but it doesn’t work that way for either platform, and of course isn’t helped by the workstation card market being smaller by unit than the retail/ORM gaming card market.
That said I did not downvote you; it’s an understandable frustration.