Interesting......just last week i added chaining my bay door to my to/do list. Not for theft deterent but in case of rubber hinge failure going down the hiway. Haven't decided whether to use chain or cable tho.
If I recall correctly from my 4106 experience you cannot get the door off if securly latched, even without a hinge. So I don't think it creates a higher probability of theft. Injuries are another matter. But, if you are inspecting them you should be able to easily see if one is about to fail. I had a old hinge break (I knew it would eventually because it looked bad) and found the door stayed on fine without it. I fix it right away because it is a pain not to have a hinge on it. I don't know about other makes or models.
The more difficult it is for the thief to get in, the more damage is done.I had a friend who never locked his car. He said he'd rather not deal with the broken glass. . . . A different way of looking at it, I suppose.I carry theft & vandalism insurance & hope I don't need it. My own experience is that my biggest losses are from the damage done, not the stuff taken.I guess I don't have much worth taking . . . The best you can do is make your stuff less attractive to the thieves. . . .