Your the first UKIP supporter I've known who opposes the monarchy, they're generally quite nationalist and patriotic when it comes to things like this? They're always banging on about the sovereignty of Britain and signing it away to the EU. They're also immensely proud of the colonial past, they're probably the most pro-monarchy party.
The Royal Family is the core of being British. Tradition is of course one reason, it doesn't really do any harm either? She puts in an awful lot of money into the economy and really doesn't take much out, and then of course it brings in tourism too. Getting rid of the Queen is moving on from the past, and seeing as we used to be the most powerful nation in the world, I've no idea why we would want to. It would also mean we're losing more of our national identity. Most worryingly of all we would end up with a president who would be very powerful as they would be the head of state (Much more powerful than the prime minister), their security would cost an absolute fortune, and frankly I don't want any political leader to represent this country.
Apologies for how badly laid out this post is :P

