When I first discovered kinbaku, I was drawn to it because I saw it as a new, interesting form of communication. It's sensual and erotic, but in my mind, it's something completely different from a verbal conversation or sexual intercourse. It can have similar effects, I think. It can make someone feel relieved, make some feel like they aren't alone, even for a period of time, similar to how one might feel after having a chat with a good friend, except no words are necessary. It can also make people feel loved, and special, I think, but perhaps not always/all the time. But that's one of the great things about it, I think. It can be used in so many different ways and have various outcomes, making it extremely versatile and unique from traditional modes of communication.
That's how I feel about kinbaku from the inside, but there's a lot that can be gained from the outside, too. It's obviously artistic and beautiful, can be used for performance, or to communicate something not just between the two who are directly involved in the tying, but to the crowd/people watching as well.