As someone who has been involved in security my entire life, it's about NEVER, EVER, EVER letting your guard down, statistics, soft targets and advertising...
Case-in-point:: Two cars parked along a creek, one is Lexus, one is an older Hyundai; the Lexus has a TU license plate holder, Winston stickers on the back and owner is putting on his waders with the back propped open...
There are no guarantees in life but my bet is a creep with limited time and a desire to score in that limited time will choose the Lexus. Yet if I drive down to any decent stream that attracts fly anglers, there will ALWAYS be a "Lexus" in the parking area...
Which in my experience means, if you DON'T want to get robbed, park your Hyundai in the vicinity....