It is true that while the jump from 256GB to 3TB is "just" ~2x -- I could get a server for 1/10 of the price of the original configuration -- but only with 4GB of RAM, and nowhere near even 18 hardware threads.
If you are CPU limited (even at 72 hw threads) you might need more, smaller servers.
But such a monster should scale "pretty far" I'd say. Does cost about half as much as a small apartment, or one developer/year.
Expensive in a relative to a low-end server or month of cloud usage, but that's an absurd amount of computational power.