Why specifically the British monarchy? Why not the rest?
Norway currently has a King. Netherlands currently
has a King. Denmark has a Queen. Luxembourg has a Grand Duke. Spain has a King. Japan has an Emperor. Etc. At this point the British royal family contributes more to the British economy and is one of the greatest land owning families in the world. The British generally support the Queen cause she's UK's ride or die chic. She drove an ambulance in London during World War 2, when she could have just left England all together. She's beloved by most - but not all Brits.