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Nearly 20 years ago there was a large supermarket in the UK that had two 'points' offers on that intersected on bananas. Cue an enterprising few to buy all the bananas (with banana points), then quickly use all their points on other items.

My school ended up with a heap of free bananas from a parent :D

Sorry, i must be slow, what's the scam here? If I buy a $10 gift card with a $10 gift card, aren't we just swapping $10?

It's the discount. E.g.: $10 buys you a $12 gift card .. buys you a $14.4 gift card... ad infinitum

The old infinite money trick, I like it!