Re: However
"I suggets you trouble yourself to find out how the Monarchy is funded"
To be fair, if what another commenter explained above about 15% or revenue from Crown property is true, it still needs to be explained where the Crown property rights flow from? Crown estates / 'royal' property comes from the concept that the monarch, ruling by divine right, owned all the land except that which they graciously apportioned to their vassals.
In a republic, any 'Crown' property would be government property and 100% of the revenue from it would flow to the government*, and I doubt it would cost 15% of that to maintain a non-royal head of state. Of course it also needs to be factored in that having a queen is a revenue generator for Britain, as many tourists want to visit Buck Palace etc
*strictly, should be to 'the people' but we all know that for all the nice theories, in practice 'government' <> 'people'