Giving up a 52k professional job with a company I've worked for and accumulated 12 years of seniority doesn't strike me as a particularly bright move. There are no jobs (unless you count truck driving or Wal-Mart greeter) where my son is now.
As far as halving the distance, that leaves me 35 miles from his school. My attorney tells me I need to live with a 15 minute drive to do shared parenting. And, even with shared parenting, some money would still go to the ex because she earns less than me.
While I find it hard to believe a woman making 40k who shares custody is going to get support but in the event it does happen, how much could they possibly justify? you'd still come out better and have your child!