Harry: I know we'll find you're lying
It seems so.
The English queen takes money from the state you admitted that above. The British gov publish some of the figures, the linked report also explains the full position. This family are a bunch of scroungers costing more than any other European royal family they also cost more than any European presidential system that is not value for money.
Royalists believe that all children are equal except certain royal children who are more equal that situation is hypocritical and undemocratic.
The Belgian royal family costs the the taxpayer around 14,2 million Euro per year directly (paid out to them to enable to do their work properly) + 16,8 million Euro indirectly.
(Security alone costs 14,5 million Euro). Together 31 million Euro, which boils down to roughly 3 Euro per Belgian citizen per year. I doubt a president would cost less.
I cannot compare to the UK, because I do not know the situation there.
The English Queen and family cost £202.4 million
Queen's Civil List 14.2
Duke of Edinburgh 0.4
Property grant 15.4
Communications, media and public relations 0.4
Travel 3.9
Government departments and Crown Estate 3.9
Prince Charles and Camilla (additional costs) 0.5
Lost revenue from Duchy of Lancaster 13.2
Lost revenue from Duchy of Cornwall 24.5
Security 100
Cost to local councils for visits by Queen 26
Total 202.4
republic.org.uk/valueformoneymyth.pdf