As a human, I cannot imagine how a couple can get married without developing likings for each other first. How do the Vulcans find a suitable spouse in their emotionless way?
Spock's marriage was arranged by his family.
SPOCK: By our parents' arrangement. A ceremony while we were but seven years of age. Less than a marriage but more than a betrothal. One touches the other in order to feel each other's thoughts. In this way our minds were locked together, so that at the proper time, we would both be drawn to Koon-ut-kal-if-fee.
As was T'Pol's.
TPOL: We haven't spoken in many years. Marriages on Vulcan are arranged during childhood. I've only met Koss four times.
Vulcan being a logical society, both parties would make solid efforts to make the marriage a success but there still exists the ability to divorce/annul a marriage if it's not working. Note that there are consequences to a refused or failed marriage, both societal...
TPOL: You've received my letters. You know I'm not interested in marriage.
KOSS: The decision isn't ours alone. My parents believe in the old traditions. For them, a betrothal cannot simply be dismissed.
SPOCK: No. Nor am I a man. I'm a Vulcan. I'd hoped I would be spared this, but the ancient drives are too strong. Eventually, they catch up with us, and we are driven by forces we cannot control to return home and take a wife. Or die.
Your thinking is common but a product of your time. Historically marriage has had nothing to do with love. Marriage was originally about reproduction, inheritance, alliances, and providing for ones children. Which is not in any way to say this was a better system. It was the system that best suited societies needs.
In fact it was often considered weird or even problematic to be in love with your spouse. Granted it has always been viewed as best to at least like your spouse and get a long but often accepted that that is not the norm.
Vulcans are logical. They need to reproduce, know that two stable parents raise children more effectively, and have a societally acceptable outlet for the male pon farr. Imagine how destabilizing it would be if a male Vulcan had to secure a partner; you see the pressure of an oncoming or during such an illogical time.
Plus Tuvok on Voyager explains his relationship with his children in a way similar to the way Data describes his friendships. They bring something stabilizing to his life, provide predictability, and they perform suboptimally when the connection is absent.
I’m sure Vulcans experience a similar situation with their spouses. Now what I really wonder is now that humans do marry for love is why would a human marry a Vulcan.
Faulty premise: Vulcans are not emotionless, they merely have much more self-discipline than humans with regards to displaying or succumbing to their emotions. As for marriage, we have seen some prearranged (Spock and T'Pring, T'Pol and Koss) and some for love (Sarek and Amanda, Sarek and (?)Peri). We have seen one affair (T'Pring and Stonn), which can only be explained as passion ("Stonn wanted me, I wanted him.").