for example, if the father pays for their kids haircut and clothing even though it is supposed to be paid for by child support, he can not write it off or lower payment, instead he would have to appeal to lower child support which involves more expenses and will be denied almost every time

This is why some men pay the child support and not a dime more. If the whore begs for more money tell her to use free money she gets every month instead of blowing it on shit. So many problems could be solved the men had control over how mommy support is spent.