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I recently visited Killarney and I thought it was a great system. As a tourist, the €2 was no big deal to have a cup for the whole week. Then I just returned it before I left and got the money back. They do this all over Germany and have branded cups for each town. It would be cool to see it more widely done elsewhere too.
You can technically get from the US to Canada via the Atlantic, so the logic checks out.