King Charles tells Britain to weather the cost of living crisis whilst wearing a hat worth 5 billion pounds.
(thespectaclemag.substack.com)
It's also worth noting that the crown jewels do serve a beneficial public service in that they form part of the monetary guarantee for UK currency - the same role as the gold reserves. While not nearly as important after the broad adoption of fiat currency over the gold standard it's still an important aspect of a nation's monetary sovereignty. Tacky as fuck yes, but they're not just tacky as fuck. And definitely far more useful for the country than the actual monarch wearing them.