Things like the Coronation, Royal funeral or Royal wedding, don't they realise most of that has gone in wages/labour to (fairly) ordinary people?
Yes, it's a hugely expensive number and hard to justify but it's money that's gone to pay police and security, the Armed forces, caterers, drivers, dress designers, travel providers etc etc all of whom then spend that in shops and other businesses.
I'm not particularly a Royal fan, but I don't object to big events that support the economy.