Old_Honky - 11:21 pm on Apr 20, 2011 (gmt 0)
Often repeated by the pro-royals this is in fact wrong. Check this link which gives the latest visitor figures for top tourist attractions. None of the current palaces are in the top 20, the tower of London scrapes in at no. 8, but this is mainly an historical attraction.
Take tourism to the UK. The Royal family, their palaces, gardens bring in billions of tourism receipts each year.