I bet you the reason it's not selling is it's location, not the alleged haunts. Location and onerous restrictions on historical properties are usually what keep buildings from selling.
The S.K. Pierce Mansion has 10 bedrooms and 2.5 baths. It also has 11 foot ceilings, marble fireplaces throughout, and it still has all of the original windows, doorknobs, hinges, and floors.
I bet you the reason it's not selling is it's location, not the alleged haunts. Location and onerous restrictions on historical properties are usually what keep buildings from selling.