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Hmm, I'm not sure. People who are curious about RasPi already know what it is, and people who wander in to the store wondering what it is are not THAT likely to pick one up. If it hasn't cost them much to do, then great, but I'm not sure if it's necessary. New models already all sell out immediately
I'm not sure about that. The Raspberry Pi foundation is big on the education market. I can definitely imagine a parent having heard about a raspberry pi but not really understanding what it is in detail wanting to talk it through with someone.
I can also imagine them running hack days for kids there (kind of like games workshop allow you to play with warhammer in their shop).