8 trips in 4 years with strollers and the only menace we've had with strollers happened during our last trip. My wife got a chocolate crossoint at the France bakery to eat for breakfast the next morning. We were parked outside Figment, and when we got done with the ride, we had a stowaway in the basket underneath the stroller. A squirrel had decided to hop into the basket, open the bag, and eat her breakfast! After some mild shrieking, on her part, I shaked the stroller and he hopped out. We ditched the bag and moved on.
Other than that, our strollers have been moved plenty of times by CMs, but we've never lost a thing. I'll occasionally leave the camera in the stroller, too, if I am sick of carrying it. As long as it's not in plain view, I don't think people are going to snag anything.