I've left my car in all sorts of places unattended, sometimes covered completely, sometimes with just a cockpit-only cover, sometimes, just open.
Parked in SF across from the Fairmont Hotel but viewable from the garage (attendant wanted me to park there so HE could see it for me), in front of the Fairmont for a few hours (there were far more exotics around me so I had the least to worry), at OSH, at Safeway, at Starbucks, at work, and just about anywhere I choose, so long as it's not raining.
It has comprehensive insurance and had it insured for about $45k as the replacement cost ( CSAA ). So like Snake2998, I drive it like any other car. It has self inflicted scratches, road rash that somehow doesn't show up in camera shots from 15 ft. away, and not built to look anywhere close to an original, but it gets a ton of looks, camera shots (both moving and stationary).
There are times I almost wish it looked the day it came home from the painters, but I love driving what I own and even more so what I built. For me, it's much like all of the cars I've ever modified and every one of those had dings/paint chips, flaws, and I'm really OK with that, even on my FFR. I'm VERY fortunate I'm not so attached to it that I can't leave it without worry.
On the contrary, should it get stolen or wrecked, I'll feel bad but it's also a new chance to build something else too or if I get too old for that, a new Porsche wouldn't be so bad.
