That's really neat, but difficult in places like California where there's a bag fee.
Our bags have big bar codes to scan, and there's also a big "+1 bag" button on the self checkout machines.
As someone who has lived in California, sounds like you have a beef with a single store.
Every time I go in I have the same thought that it's such a waste of someone's life to spend most of it standing motionless with the sole purpose to reduce theft of plastic bags.