Given the adoration for the Royal Family in many parts of the world I think it must have a tourism benefit – how much it would be affected by not having them I have no idea but that’s not going to happen anyway.
I doubt the Queen gets too involved with the finances – she has a man for that who is duty bound to do his best for her – it’s up to Gov’t to do what’s right. I hear a lot of work is needed in the palaces so money gets spent on that.
Is it right? Dunno but it’s a tiny amount of money compared to so much that’s wasted and we love ’em (mostly).