These guys rely on stealth and guile. They are very quick and avoid confrontation. They hang out and wait until no one is in sight to do their dirty work. No one is willing to waste their time staking out a parking lot.
On the other hand, if I saw someone just hanging out when I approached, I'd be very reluctant to park and leave my car. I heard a story last year about someone who did that last year. The guys followed him to make sure he was walking to the Far Side then turned back and hit his car.