[percevalve]

I think the point here is that her wealth being mostly private (or enough of it being private not being a specialist in those matters), the way she carried her duty was even more remarkable. You could easily imagine somebody inheriting similar wealth and not behaving nearly as well as she did for her country. I do not think it is about being pro or against monarchy here.

[youngtaff]

I think the distinction between public and private wealth is sophistry

That ‘private’ wealth was acquired because she was head of state

[percevalve]

I do think the distinction actually exists for the British Monarchy... A quick Googling would give you something like that: https://en.wikipedia.org/wiki/Finances_of_the_British_royal_...