If Ethan wants to be a bit more appreciative later on, he could make it clear on the website that this “In-Store Game Program” is currently in it’s Beta-Testing Phase. That way, customers like this girl who are de facto beta-testers that actually help improve the overall program (as a bug-hunter) can get a free benefit or two once Ethan has it all straightened out & goes “Full Live” with it.

That way, she won’t feel like she’s the one getting screwed.