I get the same Ebay prices $80+ here on CAG and a lot more on some Asian auction sites $125 so It makes no sense for me to deal with Ebay & Paypal when I get paid in cash & meet the buyer in person.
Its a hassle to deal with shipping on Ebay as I am stationed overseas. I get my codes almost free so I don't really worry about losing a little with some deals.
We raised close to 7k by selling Halo stuff and 12 month cards this year and all the money got donated to Wounded Warrior Project & a friend who lost his home in Staten Is.
I woudn't consider $80 to be eBay prices; I sold quite a handful at $140+ when the game first released.