Earlier quoted context omitted.
Well I (an American) agree with your sentiment, it appears that the British royalty don't actually rely on tax money, but instead they keep 25% of the money that the royaly estate /makes/ and the other 75% goes to the British treasury. But I might be wrong. https://www.bbc.com/news/explainers-57559653
Also an American and I like the British (and also Japanese) royals. Benevolent monarchs are a cornerstone of serenity and sanity. And yes, I realize the irony as an American. I think on average Americans like the British royal family more than Britons do?
So they are great until they aren’t, and then there is no mechanism to remove them.
Dictatorships are also good if you get a great leader.