He worked as a security guard, is single. You are right about the enjoyment part. That is why my wife and I did not rent out our spare rooms even though we could get a nice 1-1.2k for the two spare rooms.
However, if I was my neighbour, I will do the same. As a security guard, I know he does not earn much. Being single, there's basically not much enjoyment facing an empty house. An extra 2k is plenty of money for him.