That 37 billion figure is non sensical. Actual figure is somewhere around 425 billion. If we really want to dwell into the figures and Karachi contributions to the economy of Pakistan, then this conversation will not look good on you.Let's put that in numbers. The tax generated by "the people having domicile of Karachi" is 37 billion according to that tweet. This, btw, includes the tax paid to the province of Sindh. For arguments sake let's assume that it is all being paid to the Fed gov. The Fed gov's 2020 budget is 7.14 trillion. So "the people having domicile of Karachi" contributed exactly 37 billion/7.14 Trillion*100 = 0.51820728291% towards the budget. Where is the rest of the money coming from?
The income tax Pakistan collects is peanuts. It generates most of its revenue through other means. If you only compare Karachi's income tax with the income tax from other cities you will indeed think that you are paying for everything, while in reality you are paying peanuts (in terms of income tax).
Look, the bottom line is, no one in Karachi , Pakistan or even world at large like to pay taxes. It's taken from you by the state. You receive your pay slip, you curse the taxman and move on, till next month, rinse and repeat.
Now, here is the question for you and your kind. What machinsim is working in Karachi, where income tax is taken away from it people, which is failing in the rest of the Pakistan so much so that 2nd biggest city is no where in the picture!