I live in a house where a guy killed himself.
I bought the place knowing that.
When i found out, I hadn't even seen the inside of the house. I thought it would creep me out - I'm not superstitious, but, well, you know . . ..
And then i saw the interior decorating.
Here's the upstairs bathroom:

That's fairly representative of what i found throughout the house.
Well, except for the bedroom that was painted bright blue. And i mean the whole bedroom. Tan carpet, bright blue everything else. walls, ceiling, cabinet hardware, lightswitch, everything.
After seeing these things, I knew that nothing could haunt me more than the knowledge of what the house looked like before i bought it.
I paid less for the house than the land under it is worth, and the house isn't really a tear-down. The roof is new, for example. It just needs a lot of interior work.
In the 4 years I've been there, i have not encountered a ghost or other evidence of haunting. I presume that this is because the ghost of the guy who blew his head off in the basement (precipitating the sale of the house) knows that I'll kick the crap out of him for all the terrible repair work he did over the years if i ever get a hint of his presence.