I know I shouldn’t judge, but…
Staying in an abusive marriage for financial reasons shows pretty interesting priorities. How about if I offer you a job 9-5 to get abused, great pay ?
Staying in an abusive marriage for parental reasons is simply almost always wrong – the kids will usually be much better off out of it. Unless you won’t get the kids if you leave, obviously.
“Unproductive” marriage is a different story.