Until some sort of bike locker is available everywhere there are handicaps parking spots, you won't see many commuters or errand riders. I would love to ride for errand, but no way I'm going to chain my bike to a post.
Seriously? Is your bike made of gold? My bike is valuable to me too, which is why I carry two locks. But I have no problem locking it to a bike rack, post, parking meter, railing, or any other secure element like the rest of the world does - or at least the other utility riders in Denver.
Having a complicated locker/key at every retail establishment would take up way too much space, (bike is supposed to be easy and SAVE space,) and just be more trouble than its worth. Plus I like seeing different peoples bikes.
p.s. The elderly lady at King Soopers/9th Corona doesn't even lock her big clunky yellow basket laden Dutch cruiser. Say hello if you see her. She's originally from Germany is the best example of a utility cyclist I know in my 'hood. I haven't seen her lately because I've been going to the Cherry Creek Safeway, which unlike King Soopers actually has food on their shelves including the strawberry/banana Dannon yogurts that I like.