We’re into semantics. They’re probably better described as influential as opposed to powerful but influence + wealth = power in my book. Either of those alone actually but combined for sure.
Okay, I see you point. However, I don’t think anyone needs to let rich celebrities influence them. I don’t.
As I said, the British family have limited power in the nation, apart from their wealth, land, and symbolic position. If there were anything really meaningful that the Queen wanted to change, she couldn’t do it without the agreement of Parliament, and she couldn’t even suggest it, herself: she would have to persuade a MP to do it.