Funny thing is, I read that on a website but when I went down to the post office to ship the gift cards, they looked at me like I was crazy. Guess you can't believe everything you read on the internet - imagine that!

I'll try to find the link as soon as I get some free time - so like never. Kidding I'll see if I can find it.
Update: here is the link: articles.mcall.com/2011-11-26/news/mc-watchdog-holiday-shipping-20111126_1_gift-cards-ship-gifts-cabinet
After reading it a second time, it looks like it was just someone repeating something they heard.
I've come to the conclusion that eBay isn't the way to go when selling gift cards.
Buyers are paying about 90-92% for big box store cards.
Subtract eBay's 10%.
Then subtract shipping, which is now a huge risk since they can't be insured.
And you're getting about 78% out of every $100.
If you go to giftcards.com, they pay a little better than that. Plus, you can enter the card number and pin and they'll transfer money to your PayPal account. Much more convenient and less risk involved.
Also, some CoinStar locations are now buying gift cards. They don't list the percentages on their website, so I'm not sure if it's a good deal or not.