It isn't a reason to abolish the monarchy but the cost per person / tourism arguments have absolutely no grounding.
"Royal Palaces" such as Versailles in France get far more visitors than the Royal Palace over here.
You either believe in having an hereditary un-elected Head of State or you...
That figure excludes a number of things including security and the cost to local councils for Royal Visits.
I think it's fair to say the football clubs contribute for the cost of their own policing but the Queen doesn't :)