As has been pointed our, if the 'guy' in your example really does make $3,000,000 he gets roughly $1,200,000 lopped off in income tax alone before the money even hits the bank.
To complete the equation then he pays $1,200,000 and gets back $3,600 (which is also taxable) for his three kids. Net payment -> TO -> the government is $1,196,400.00
and that's before the dozens of other taxes we all have the privilege of paying.
And besides, for every 'guy' making $3,000,000 a year, there are 1000's of middle class family's that will gladly cash that cheque.
Is it a perfect system, no. (But neither is some Government run Mega-Care system; or
no system at all which you seem to be insisting on).