This is an important topic for sure. But -- for the most part, they probably won't pay and pay and pay.
A U.S. Census report estimates that just 43.5% of custodial parents get the full amount of support they're entitled to. And more than 30% don't receive anything at all.
Often, they just wear the custodial parent down with the time and cost incurred by going to court, serving papers, and paying attorney fees. Eventually the custodial parent gives up.
State and federal resources are -- theoretically -- available to help. But they don't always work. Which is why more than half of custodial parents aren't getting the amount they should.