Moving in Together Doesn’t Match the Financial Benefits of Marriage, but Why? - WSJ

“We’re already saving a lot of money and splitting the cost on most things,” she said. “I don’t understand how married couples are accumulating wealth in a way we’re not doing.” 

Because married couples are a team with permanence? Not a pair of people going Dutch on every line item every month.

“I care a little bit less than I thought I would about marriage,” she said. “Once you start living together, it almost feels like you made that commitment.”

Until he dumps you for a younger woman and now you’re single AND homeless.