Wow, gmanedit, I live in a big little town where people still live their house doors unlocked! Once a good friend of mine dropped her wallet in the parking lot and when she got home several hours later, the finder of the wallet had returned the wallet and left it on her kitchen counter! Another friend used to leave her keys in her ignition in the parking lot at the grocery store. I've also seen keys tossed on the front driver's seat as the owner popped into the store (this scenario usually involved rugged looking manly types with pick-up trucks. I guess pocketing your keys is not cool with these types?)
All the same I know better, I'm from Detroit! I even lock my car when I pop over to my friends' houses for five minutes and I park in front of their house on the street. My motto is better safe than sorry even if it makes you look a little silly.
So, between the low odds of having my Imago stolen and the high durability of Tom Bihn bags, I'll be (happily) carrying my Blk/Blk/Wasabi Imago for a looooong while until such time comes that I can justify another investment! ;)