Bloody free-loading royals ... about the only thing the French got right was handling monarchy.
As far as the UK is concerned they make us a fair bit of money. Every day we have hundreds of thousands of tourists doing the 'Royal' bits, Buckingham Palace, Windsor, etc etc. I see hoards of Japanese tourists at the gate snapping away and think of all the money they are spending! Then there is all the peripheral business such as hotels and resturants. I am sure many of these tourists only come for the relatively unique system we have here.
In addition to tourism there is a complete 'Royal' industry in nick-nacks and books and magazines. Without the Royal Family a lot of people would be worse off or even unemployed. They earn their keep.
George