$10 passport for online play.

So? The publisher still got their full price, why should they get paid a second time?
A car loses 40% it's value the minute it drives off a lot. They'll buy it back at less than half what you paid and sell it for up to 80% easily. This is how business works.
Who exactly is Gamestop hurting there?

People don't sell their cars back 3 days after they've bought them. People who sell their games used, without the help of gamestop, would usually have to wait some time to do it or go to some ridiculous efforts on ebay or something. Game companies used to be able to put more new games on the shelves because there was a demand for them, they didn't have to compete with the same game being recycled over and over.

This doesn't happen with cars (at least not while they're still full price, later on in their lives they get passed around a lot) it doesn't happen with CDs or even movies. Piracy does but there isn't a huge USED NEW CD market. A game company can sell like 6 new copies of a game to gamestop and those game can then leave their hands and come back 100 times. If that option wasn't available, there would be more new game sales, guaranteed. Maybe not 100 sales worth, but a few more. And the price difference is so negligible that there SHOULD be more new game sales. If someone can't pay that extra $5 near a game's launch then they should absolutely have to wait a few months to play it.

I don't think it's right for gamestops to be selling used copies of a game at near full price, especially when the game just came out. Game producers work hard on games--way harder than musicians and arguably as hard as movie makers--and they have a lot more pomegranate deal with between this and piracy.