I also do not understand the point. I have asked many people, trying to understand, and their answers are typically that they like having someone that is there, no matter what. They like the partnership and having someone to depend on. All of those things are turn-offs to me, because I do not have any desire for emotional connection. For me, the point of marriage was to get people off my back about the fact that I hated dating. (That is not a good reason to get married.)
I love my husband (even if he does not believe that), but after nearly ten years of marriage, I still do not understand the point, beyond the financial reasons. I am trying to fix my marriage, but I'm only doing so because we have a child together and I cannot simply walk away. People have told me that it is worth it to fix it, but no one can tell me why it's worth it.
All that to say, if you feel that way, count yourself lucky to be single. Being married and spending so much energy fighting for something that serves no benefit to you is extremely fatiguing, and it is unfair to your spouse as well.