its not about if he wants your car or not... its about wether or not he's willing to go through all of the work of disabling your 3 point immobilizer, then disabling your alarm, finding your kill switch then ripping out your ignition... most theives are theives for the fact that theyre too lazy to do anything else.. why would they want to go through all that trouble? they'll just move onto the next car.
this topic reminds me of an article in a WHEELS magazine someone told me about. it was about an alarm company that offered keys to a ferrari to the first person that could break into it with their alarm installed within a certain amount of time. the who's who if crims came and tried to get into it with no luck. then there was another guy who walked around the car, walked up to the front of it and started kicking really hard into the front bumper... he eventually kicked it hard enough for the airbags to come out and the doors to automatically unlock.