There are many couples in England that are "partners" instead of spouses, complete with home ownership, children, etc. One company there told its employees that unmarried couples would not be allowed to stay together at overnight meetings, which inspired a few to get married. Ironically, those who did marry improved in their job (and consequent financial) performance.
In other words, it was the commitment of marriage that made them successful. Waiting for success before marriage was the exact wrong way to reach the goal line.