I don't think it's the cut of the $5 that the consumer gets that the publisher wants, it's the $30 that gamestop slaps onto that to resell. I don't know what way gamestop prices things everywhere else, but in Ireland it's a rip off to all parties.
You buy a AAA title for €60, don't like it, trade it back in again a few days later. You get €10 - €20 for it. This then goes back on the used shelf at the €50 - €55 price point, just enough to make it slightly more attractive than purchasing at the rrp.
It's expired. Put your phone into DFU mode and restore it to 7.0.2 from itunes.