Wouldn't SCF imply the cost has already been born? Divorce is relatively simple without kids. If kids enter the equation, the cost of divorce is the different

Wouldn't SCF imply the cost has already been born? Divorce is relatively simple without kids. If kids enter the equation, the cost of divorce is the differential between what it ACTUALLY costs to support the kid, and what you'd be paying in mandatory child support (many states like 30% salary after taxes.) That could mean a huge wealth transfer from the one without custody to the one with, with no change in resources spent on the child.