My iphone 5 is completely broken, i want to sell it to gazelle.com?

The screen is cracked with hammer, it does not power one, and I can even see the inside from the screen which is exposed a bit. So how can i still sell it for 80 dollars on gazelle.com? Is this some kind of trick or is it real? I just inquired a box from them waiting to send my iphone to them, and i get 80 dollars for a piece of waste? I just don't understand why would they pay 80 dollars for a piece of metal. Can someone explain please?

You won't get 80, it will be worth much less I'm guessing when broken. You can also trade it in and upgrade, as they will give you something back for it even if damaged.