Too bad all of the "studies" they discussed were clouded by suggestive comments made to the participants for "ethical reasons." Those darned ethics always get in the way of science and business (well, only sometimes with business).
There's not really much substance to this article. It would be interesting if the somewhat recent threads regarding nocebo/placebo responses were extended to ghosts.
There's substance, they just ended up disproving what they intended to prove I think.