Maybe the people should seize their land back?
Even if anyone wanted to, this would be very difficult as much of the land has been disposed of over the centuries through gifts to the aristocracy, "payments" for services rendered and so forth
Another interesting point concerns the so-called "private" properties such as Balmoral and Sandringham - specifically, where the money came from to purchase them
As ever, these are complicated subjects and offer plenty of opportunities for the monarchy's advisers to pull the wool over the eyes of the less informed .. something they've had a great deal of practice at