Its not so much that you need the money. Its a show of respect for your children. Rather than her blowing several hundred on self or OM each month, take it in child support, save it for an annual trip and take the kids somewhere fabulous or sock it away for their education or first house.
It will be your way of ensuring that their mother respects them, and will help their self-esteem/identity to know this support came from her. They don't ever need to know that it was forced/court-ordered. Over time, as XW stabilizies a bit more, she may come to respect them and her role more, and may do it voluntarily. Maybe her gift of time will follow this investment in CS.
