Why does Forever 21 offer gift cards?

So that they can make more money, and their getting paid by other companies to sell you their gift cards.

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Many businesses offer gift cards, because in some way, it guarantees them business. When a person is giving a gift, they may be aware that the person they're buying for enjoys shopping in a particular place, but isn't quite sure what to buy for them, thus they give them a gift card. This brings in two customers, if not more. It is a marketing tool, but also a convenience to customers.