Why is this even a thing? It's a Scottish castle in Scotland that's been run by Scottish organisations since, well, at least since 1991.
Because there's a class of people - and in my experience there's a higher proportion of them amongst Tories and Tory supporters - for whom everything is a resource to be exploited and they are the people entitled to do the exploiting. To them, Scotland is one of those things that's 'owned' (and, to them, that's no different to, say, Essex, but obviously to the Scots it is) and should be their's to exploit.
O.