What is child support?

If you ask anyone involved with a non-profit they'll tell you that time is the most valuable asset they have. Those that give unselfishly and with extreme compassion are the fundamental of any non-profit. In a sense dads act the same way toward their children, when allowed, which makes me wonder why that is hardly taken into account in the courts.
In no way is this a pity trip for dads out there, however why are we still seen as nothing more than walking paychecks? It's as if the courts would rather a single mother raise her child/children while the dads are told to worry about nothing but working. As a dad my most enjoyable moments in life literally involve my children smiling. Be it Owie smiling with ego when he says he's a big brother or Brie smiling when she realizes her input is blatantly desired.
Children need unbiased and unforced involvment from dads as well as moms. It's highly unfair fathers are mearly a tool for financial resources in the eyes of others. Being a single parent is far from easy and I commend those that religiously put out an effort to make things work through a partnership. If a child craves time with a parent why are lines "it's not daddy's day" an acceptable response? I heard today while working a mother withholding her child from seeing his father because he was out of work sick the previous week I believe and couldn't pay her support in full.
If this mindset of entitlement is to continue, will the childrens' best interest ever be considered? How are the times "so different" and how can we say we are "growing in acceptance" as a whole if this is still not adressed? I have known countless fathers who work literally to provide someone elses lifestyle. I do not mind convenience, but if we want what's in the best interest of the children how about this "equation"?

A father who makes no effort at all to see his children, or does not value their time with them should pay a little financially. It's the least he can do, right?

If a dad is told he has to support his child, how about taking the child clothes shopping? Play catch with his child or ride a bike instead of having a need for baby sitters? If need be, have the dads submit what they buy for the children, that is kept at their house. Allow parents to compromise as partners and go through councelling if need be. It would be people could seperate their selfish needs and desires and truly put their children first.