For Amazon lets say, they redeem a gift card.
They visit the site, now they are familiar with the site.
Now there is a new audience exposed to Amazon, who now feel comfortable going to because they where there before.
They have bookmarked that site.
They tell their friends.
This is a new young future buyer.
Then they want to buy something else, they go where they are familiar, in this case Amazon.
How much is that worth?
No money there?
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