For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows.
-I Timothy 6:10, KJV
A popular Christian curriculum for people going through divorce would regularly try to dissuade people from divorcing by pointing out the financial cost of divorce.
I find this scare tactic especially unhelpful for faithful spouses. It is just making it more difficult for them to take the hard, necessary action. Plus, motivation out of fear is not a godly motivation (see 2 Timothy 1:7).
Yes, divorces are costly.
This is a fact. What is missed in these scare tactics are the costs of staying in an abusive relationship. That is what staying with an unrepentant cheater is–namely, abusive.
I still believe divorce is a real, godly mercy (see Mt 19:9).
Like a costly surgery, divorce can be the gateway to life from a dangerous situation–namely, an attachment to a destructive person. The cost is not the point. If you have to amputate, you amputate.
I srarched for the source study for 2nd marriage failure rates. They use those numbers in Divorce Care class as well but no one can point to the actual data for those numbers. That topic would would make a good blog post.
I spotted this: https://www.gottman.com/blog/10-rules-successful-second-marriage/
But the link was broken to their source for 60% divorce rate on second marriages. Plus, 50% is not accurate for first marriages as I understand the data.