That is a bit of a daft presumption, isn't it?

Do you really believe that the draw to the Tower of London is the current members of the royal family? I would have thought that the attraction would be the associations with William the Conqueror, the tudors, imprisonments, tortures and executions, the ravens. In all, distant history - I don;t think the 1940s executions are much of a royal connection. I will concede that the crown jewels is an attraction, but I would dispute id this would a sole reason or even a main reason for visiting the attraction. I would argue that people visit Windsor castle because it is a castle that is accessible and just outside of London. I suppose I should concede regarding Buckingham Palace which would mean that the royal family co contributes to no more than 5% if hospitability and tourism. Also, if the monarchy was abolished, would Buckingham Palace be any less of interest? From my knowledge the Palace of Versailles doesn't suffer in visitor numbers through France being a republic.