My two good friends did this, somewhat for financial reasons but mostly for their two kids.
HOWEVER, their divorce was very peaceful and it was simply because they wanted different things in life and were slipping out of love. They were still good friends so didn't mind treating each other as roommates. They got separate rooms. While the kids were young, they knew their parents were not together but didn't have to split time between them and they could all still do things as a family.
When the youngest turned 14 they decided they were old enough to understand and respect the decisions, so the father moved out. However, he remained very close by and they still all do things together.
All in all, if you and your ex are fighting or don't get along, I don't think you're doing yourself or your kids any favors, regardless of financial situations. I think staying together after a divorce is for specific situations. But if you can keep the peace, I say go for it.