We have people who abuse the welfare system everywhere in the world. Right now, we have people in the U.S. who do not want to go back to work, because they make more money collecting unemployment/welfare than wages.
Funny thing with these "parasites", be it "Royals" or others is, that you have all kind of statements that say how much it costs, but no hard evidence can be found to support the numbers.
You say it cost the taxpayer 20p. What is this based on? Cost divided by population? Total expenses as part of total tax revenue?
Anybody who wants to twist the numbers so that support their opinion, can do accordingly.
I look at a small number of people living in obscene luxury at the expense of the community and have a hard time agreeing it makes sense in the 21st century.