The divorce rate is so high NOT because of any 50/50 equation. The divorce rate is so high because people are selfish and hedonistic. They want to marry in a church yet they don't honor anything God teaches. They treat marriage as something that should always be fun and happy and they ditch it when it becomes routine or troublesome. They are selfish, selfish, selfish (along with being very immature)
Nothing is ever 50/50. That's a dream. However, everyone should be contributing and couples should view their marriages as partnerships, not adversarial relationships. When we treat our spouses with respect and honor our vows, the rest falls into place.
Smart saying you quoted.....as my husband always says, when your new wife asks what makes you happy, always respond, "Whatever makes you happy, Dear." I just love smart men:)