I actually love the ideas you just posted. Though I like the ghost version, the only downside is that the environment would have to be dark and eerie like Legendary Truth last year, therefore not allowing the colorful flashing lights and sensory overload that would compliment a casino-themed house. In that sense, I think the vampire version would work best.
As for the ghost version, I think it would be nice to use that as the sequel house (a la PsychoScarepy) for the next year. "The mafia has one owned this casino, only to have been over-taken by vampires. Now, the blood has run dry and the vampires have fled the casino and Carey, Ohio. The U.S. government has condemned the building and wishes to tear it down due to its state and gruesome history; unfortunately, the workers that have tried to demolish the place have been mysteriously murdered by what seems like evil spirits of those who have died in that former vampire-ridden casino. Now Legendary Truth is looking for some extra volunteer investigators to rid the place of evil spirits.