Like he's just forking over 2.5k per month and not doing shit else with his child. He could have his kid 4 days a week, paying for all of his/her shit and STILL have to pay child support.

This is one reason why the child support system is fucked-up. No credit for the father handling his business outside of the courts, and no oversight on how the money he does pay is spent. It's automatically assumed that he's the "bad guy."