The authenticity of the stories might be what makes them interesting. In a world full of fictional horror, true ghost stories stand out. If Kimberly and John have verified the sources of these stories or have had personal encounters themselves, it gives the stories more credibility. Their stories might also include elements that are not commonly found in fictional ghost stories, such as the psychological impact on the people who experienced the supernatural events. This can make the readers more engaged as they try to understand how someone would really react in such a situation.
Well, it could be the personal touch in their stories. If Kimberly and John are sharing their own experiences or those of people they know, it makes the stories more relatable. Also, true ghost stories often have details that are hard to dismiss as pure imagination. For example, if they describe a specific location and the strange events that happened there in great detail, it draws the reader in. It might be that they have a unique way of presenting these stories, making the readers feel as if they are right there in the middle of the spooky events.
The mystery aspect probably makes them interesting. Ghost stories always carry an air of the unknown, and if Kimberly and John have collected true ones, it's like getting a peek into the supernatural world.