Hypothetical question:- If you remove all the dirty money, from organised crime, Domestic and foreign and corrupt foreign governments that is filtered through the city, realistically how much revenue would the exchequer lose?That is the point. The "schmucks" may pay some of the bills, but the largest single contributors to GDP, income tax and corporation tax are from the City. You don't suffer, you are subsidised.
Now don't get me wrong, there are a fair few in the City making a decent wage, but they contribute loads too. Lose them at your peril.
Taxed to **** and Bar