Is it in the interest of grocery stores to exclude customes without a good reason?
Hopefully the significant fines would keep this at bay. In all honesty kicking the store off the system would be the best way to stop it.
As a side note: I support the right of store owner to punish dick customers. I believe society needs to have stronger mechanisms to penalize douchy behaviour.
I agree with this, but I don't believe that a store ought to be able to farm out this punishment to every other retailer that subscribes to this system.
If a customer is being a dick, bar him from your establishment; don't subscribe them to be discriminated against and harassed everywhere else.