Dan is having a hard time getting sleep with all of his specter visits? Well Dan is extremely cheap and stubborn, so chances are he won't be moving. Dan would likely invest into some really good noise cancelling headphones. Dan would wear his headphones every night and if, by a slim chance, the apparitions still wake Dan up, he would have to just suck it up and learn to cope with it. Lots of naps would be had in the afternoons at the arena. Dan can't see the other options as viable for him. He enjoys his privacy too much to be willing to start a haunted house, and he doesn't have enough time to start another business hunting ghosts or anything. Therefore his only options would be to to sell or learn to live with it. Once you are settled into a place, nobody ever wants to go through the hassles of moving haha.