I would never accept less, but I have been by not addressing the issue.
We both earn the same amount/month. The military sends him my my way for work often so that expense isn't a cost to him. He did buy 3 plane tickets to come for vacation and he stayed with me every time so the only expense he was out was the airfare, he used my car. He is a 4 hour plan ride away. I understand where he is coming from, but his logic doesn't support what actually happens. If the children were going back and forth I could see me purchasing my ticket + one of the kids but I'm not thinking his airfare due to poor life choices should decrease the support amount. Like you said before, he could just not come visit.
As far as I know the state calculator doesn't account for travel expenses for the parent.
