[cthalupa]

> there are no legitimate circumstances where someone would want or need to sell amazon gift cards at less than their face value

Many credit card rewards programs offer Amazon gift cards as a redemption option. The points:value ratio on these is generally significantly better than the ratio on cash rebates, even when you consider the hit taken on sites like purse.

e.g. 10,000 points might be redeemable for $100 in Amazon GC, but only $50 in cash, so even if you get the GC and sell them for $85, you still do better than if you had straight redeemed it for USD.