The cost of raising kids is invariant of the father's income. A person who makes a million dollars a year should pay no more child support than one who makes $50k a year. No child is owed a lavish upbringing whether wealthy parents are married or not, and the presumption of such is a rather sick and immoral perspective. You might as well force married people to spend a specific amount of money on their children as a function of income -- it is the exact same thing.