Imagine lots of shops issuing these tokens, the public will start using them because they get discounts and benefits for holding them
Maybe I am getting sidetracked, but could it happen that some less morally inclined personnel might embezzle a portion of those tokens that are as you say obviously valuable?
I'm actually glad you brought this up the open nature of a blockchain based rewards system actually lowers the chance of an individual within a merchants company committing fraud, as every interaction is trackable and verifiable, unlike a traditional database system that is more easily manipulated.
In my country when a merchant makes a good campaign, personnel embezzles all of them and you can't apply it. It is a disgrace.
And reading that it can prevent with gatcoin is marvelous.
I hope one day you will be in my country too.
I'm sure there will be mechanisms for preventing that. like the destruction of the issued tokens, or the expiry of the campaign, making the tokens worthless.