What do you think of people that marries fictional characters?

I dont really take fictional characters seriously therefore i dont have any huge attachments to them. But what do you think of the people that takes them very seriously that they would want to marry them? Akihiko Kondo is one example for this. Hes married with Hatsune Miku, a virtual pop star. Another example, Lee Jin-gyu that marries Fate Testarossa from Mahou Shoujo Lyrical Nanohain (im actually unfamiliar with this character) in a form of body pillow. I personally dont have any problem with it as long as they dont cause any harm. What are your opinions?