If I don't feel any negative energy while touring and looking at the house, heck yeah if its a 500k house slash down to 100k, it's a steal...why do I say that? lols cuz the ghost will protect you and the house...but if the ghost or spirit don't like you...usually maybe it's because they were or are racist...lols even in the after life...lols... and you already bought the house...only few places will make you a silver bullet...lols j/k
but on a serious note, heard of stories where past and deceased owners spirits still dwells in the house..someone try to break in, they will scare the bad guys away...or if you're asleep, they will do something to alert you..no need for motion sensors..lols