I'm very happy about being married. It allows us to plan knowing we can count on the other one to be there, and embark on large joint projects like childraising.
Divorce would suck, but we both know that and would try very hard to avoid it. Talking a lot seems important here, prioritizing the relationship, and valuing the other person's happiness as your own. I only have six years of practice though, so I could be wrong.
It doesn't seem to be worth the effort.
Speaking from personal experience, finding the right relationship can be HARD. I recently came across a rational take on finding relationship partners, much of which really resonated with my experiences:
http://waitbutwhy.com/2014/02/pick-life-partner.html
http://waitbutwhy.com/2014/02/pick-life-partner-part-2.html
(I'm still working my way through the Sequences, and lw has more than eight thousand articles with "relationship" in them. I'm not promising the linked articles include unique information)