I feel that the literary element of ghost stories - real-life ones, as well as fictional stories - is often tremendously important; this, as much as anything else, makes the stories insistently memorable and far more so than other tales or news and so on. Just to give two personal examples of this from the Borley Rectory legend:
* The messages scrawled upon the walls: a writer of fiction could not have done better, as regards creating a certain and 'poetic' atmosphere. This aspect suggests that the dead are not truly far away from us, the living; and, in some instances at least, they are instead 'lost' and confused. A very slender 'veil' indeed. The aspect, haunting as it may be, actually haunts our memories because of the supposed ghost's appeal for our help and not only Marianne's (which is in itself a rather poetic, Romantic name).
* The - probably unconfirmed - incident when, supposedly, a young woman fell to her death through glass. Such is the drama of the alleged incident, such was the power of that image that I could 'see' it in my mind's eye...and yet it may well be merely a fictional invention, one created to shock the reader into caring about a tragedy when, sadly, tragedy is part of our everyday reading because of newspaper headlines etc.
Of course, there are many more elements of the Borley story that trigger our imaginations and sympathy/empathy: e.g. how many of us have pondered on the life, the struggles, and the afterlife of the 'nun' whose sigh was supposedly recorded in the local church? A whole world of imaginative 'sympathy' is opened up to us from that one incident alone; the accounts of the Borley hauntings are, in many ways, so resonant that they are almost symbolic - we read into them what is already within us. No wonder that they linger in the memory.