there is a guy across the street from me who leaves his bike outside day and night no lock. It is a decent bike. I still lock mine to an immovable object and just a cable lock as it it right outside my door and someone is home most of the time. When we went away for a few days I stored the bike in the house.

Also at work there are two other guys who occasionally ride and neither locks their bike. Yet again I still lock mine to the immovable object and use a cable lock. At work they can check a security camera if the bike was stolen. I do not want the hassle of the bike being taken, so the lock is my deterrent.