The short length. In just two minutes, you can get a quick dose of horror. It's perfect for those who don't have a lot of time but still want to be spooked.
I think it's the element of the unknown. Ghost stories by nature are about things that we can't really explain. In 'two minute ghost stories', this is amplified. The stories are brief but they manage to create a vivid picture in your mind of something otherworldly. Whether it's a ghostly apparition in a dark alley or a haunted object that brings bad luck, it makes you think about the existence of the supernatural and that's what makes it appealing.
The variety of stories. There are different types of ghosts and haunted places. Some are about vengeful spirits, while others are about lost souls. This variety keeps the readers or listeners interested. Also, the way the stories are told often has a sense of mystery. They leave you with questions and a bit of a chill. For example, a story might end with a sudden disappearance of a character and you're left wondering what really happened to them.