Being with someone right now is not proof that relationships are transactional. What happens when you can't foot the bill in that kind of set up? Or thing get boring and stale. One or the other of you will bail as soon as possible.

How is that success?

Further, even if you did stay together because of money, the kids, tradition, what have you ... you will still suffer the effects of this kind of thinking. It's dehumanizing. For both of you. Full stop.

Married/attached lonely is the worst kind of lonely there is Dude.