You clearly are not good with numbers, aren't you? Inter sold Hakimi for 70m as well. They are generating close to 200m from selling two players only, not counting the money they're saving on wages from Conte's departure. Of course they can afford the Dzekos and Zapatas of the world.
With Ronaldo earning +30m/year, it's smart being stingy in the Locatelli deal. We don't even have competition to sign him, why should we overpay?