I work in Baltimore, and I have (so far) experienced an interesting phenomenon: When I drive Bridget into work, people along the route cheer and ask questions. She gets parked, as is necessary, completely open. There is no lock on the glove box; the front trunk pops with a lever that would be easily found by any experienced thief.
No one messes with her.
This can't be because no one sees it. It's not because cars in the lot behind our office don't get broken into. They do.
So why does my car get left alone?
I think there are three reasons which, in combination, make it less likely to be messed with.
1. There is no GPS, stereo, or center console (with quarters in it) visible. Most thefts in my neighborhood are by junkies/homeless dudes looking to pick up change or something they can flip instantly for a fix.
2. As it happens, even junkies like beauty. Not saying a desperate, jonesing addict would never touch a classic car, but there is a thought process.
3. Respect/fear. On the street, every exotic car is owned by someone who is presumed to be a drug lord. Therefore, it is owned by a killer. People in Baltimore think my car is a Rolls Royce or Bugatti, and so the person driving it must have juice. Obviously if they meet me they understand that I am totally rip-off-able. But when Bridget is parked, she is presumed to be owned by a player, and thus left alone.
Your mileage may vary.