I don't know why these arguments always centre around the Monarchy anyway, they have no real power, and even if we dissolved the Monarchy, does anybody actually believe that any of that money would make it's way back to the public? People will happily say that the Monarchy is a drain on money, but suggest that people who can't afford to raise more children stop having them and all hell breaks loose, suggest we use Nuclear power more because it's greener and cheaper and you get the same reaction.
There are so many drains on the UK economy, and, especially with the tourist revenues they bring in, the Royal Family are a very small drain indeed.
Thing is, make it about a grudge from several hundred years ago, and it's voting for all the wrong reasons.