I really think it comes down to how much space a quilt store has. I also like that I know when I go to one LQS they are highlighting civil war prints, so if I want 30s prints, I go somewhere else. I don't waste my time driving to the store hoping I will find something to go in a project, if I know they might or might not be currently carrying something.
I don't like it when stores try to cover too many "genres" of fabric so they only get a few bolts instead of an entire "collection."