Assuming that it really is haunted, I guess if you're that rare employee alone after hours at just the right moment maybe something unexplainable occurs. If you look at their website or at their offerings in the gift shop, they very heavily promote their hauntings to attract tourists. And no, I don't think that means all visitors will have something odd happen, but if you're "the most haunted house in America" I expect that someone who is sensitive will feel something odd somewhere inside the building. Now, many publicly open places are haunted and acknowledge it without seeming to shamelessly exploit it. Sadly, when we left the Whaley House the only feeling of discomfort I experienced was the one of being duped.