If one is anti-monarchy protestor and ten is a lunatic waving a flag with Union Jack face paint then I'm about a 6.

A living royal family presumably has more value than not. It doesn't take a lot to payback the cost if you review over a longer window than just this weekend and look beyond tourism.

It would be interesting to see how the event was covered elsewhere. Advert breaks stuffed full of UK tourism advertising? Probably.