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I guess perhaps the range of places it's available is wider than those selling gift vouchers? I know of only one shop around me who sells Amazon vouchers (my local supermarket). If you need a Smartphone app, though, how many people are likely to have a Smartphone, but no credit card? Teenagers, maybe? Probably not too many other people.
Anyway, as you say, if they're giving you $10, I'd go for it! I spend at least $50 at Amazon every month.
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