The idea that you'd base your method of gvt on how tourists would view it always amuses me. Anyway as Steve says the tourist angle is much overplayed. According to Visit Scotland the only tourist attraction in the top 20 visited attractions which has anything to do with the modern royalty is the Royal Yacht Britannia and that is only at #20 and in truth its presence or not is unlikely to make any significant impact to overall tourist numbers in Edinburgh. There are much bigger attractions in the city. I was kind of surprised Holyrood Palace wasn't in the top 20 but again I think its association with the modern monarchy isn't the main factor in its pull anyway. It is the history of the place that attracts people on the whole. Versailles is still a huge pull in France even though their monarchy is long gone!!