Yeah, I'd recommend getting just one small ghost at first. Once it has established a haunting ecosystem in the hotel, wild ghosts will start to migrate there.
The "cars give you freedom" argument also completely breaks apart if you stop to think about the millions of people who can't drive, such as children and blind people, who are forced to rely on someone else taking them everywhere because they can't walk without getting run over and public transport is nonexistent.
Op said free, also hosting your own server isn't something everyone has the knowledge, time, and resources to do.