I accept that their existence is based on what were norms at the time. It's like slavery (in all its forms) -- it was once an economic normality of economies around the world, but we have evolved to understand that it was/is cruel and abhorrent.
Kings, Queens and fairy Godmothers then, belong in children's books and the writings of history. I don't understand why a modern-day nation can support a Head of State and his ilk who is totally unelected and - in Charles' case - meddling and unaccountable. People seem to have this blind love of them, with any criticism immediately shot down. People also seem to assume that being republican means not being patriotic. I'm proud of Britain and the hard work and achievements of its generations of hard working people. I cannot be proud of a state-funded family of people. They are irrelevant in my eyes.
The tourism revenue gets pushed a lot, but even the very highest estimate of their income is just a tiny fraction of our overall tourism revenue. Just think of what we could earn charging tourists entry to their castles, homes and estates, as the French did.