I could but I wont. You are basically offering me a few dollars in credits for an $80 gift card. I understand you are new and probably don't have many credits right now. Work to build them up so you can win a great item like this.
I don't know where you are doing your math? If you are using what it would cost to buy credits from listia then maybe. My GIN is very reasonably priced for this website. Check other GIN for iTunes gift cards and I would venture to bet my is the best rate on credits to dollar ratio.
Yes this is legit. You can check my feedback and see other items I have listed. I have already listed and sold 2 other cards just like this one. I would expect this auction to go over the 100,000 mark. So again, good luck.
I can scratch off the code from the back of the card and message you the number. That way you can use the card immediately and not have to wait for it to come by mail.