When we first opened, I booked a local Psychic Reader, and set him up in the front of the shop. Had done local advertising, and signage in-store a week in advance.
Net Benefit: Zilch. Only 2 peeps had a reading with him.
Net Detriment: Two customers, plus one of our servers, had a hard time with him being here, as they were devout Christians. Very offended!
Needless to say, there was no return engagement.