It's a reason to not make loads of useless DRM. Suing people that heavily pirate or enable pirating is in their rights.

buying/selling used games probably hurts sales more than pirates do. the people selling and buying used games have shown that they are willing to spend money while many pirates are not.

also how do you even describe a pirate? if i lend a game/movie to a friend its not pirating, but when i send the same thing to the same person over the net it becomes pirating? at what point during the file transfer is it labeled as pirating?

People that constantly get pirated copies would count. People that pirate even five dollar games would count as long as it's constant.

As for used sales, the best options are a) games people want to keep, thus reducing how often its sold, and b) making lower prices for minor games more common, such as how Nintendo charged just $20 for Brain Age, thus reducing holdouts for the lower prices of used games.

To me selling your games to a used market is that lowest circle of hell thing. You are profitting off someone else's back and are very much like the pirates who go and make money off their "sharing." Not the ones that get no monetary benefit from it other than the "savings." That said I have to do a shameless plug because I posted a great article about this very thing not 3 weeks ago:

http://gamrconnect.vgchartz.com/thread.php?id=125882&page=1&str=2122695391#

as always, i will post this video

nice lol, ive never seen that before, its agreeable

there is also an amazing extended remix to that

http://willbe.bandcamp.com/track/nina-paley-copying-is-not-theft-willbe-remix

I don't see how someone selling games to a used market (or straight to someone else for that matter) is profiting off someone elses back. First it's hardly profit since the money spent on the game is almost always more than the money one can get back.  Second when they sell it they no longer can use it. Like a book or a DVD even a CD (although with CD's almost everyone can just rip them so they can still have the songs but loose the disc cover and any pamphlet)

Next what do you think most retail is by that standard then?

You profit from it because you gained the experience of the game, plus you made money after you were done with it. You made some money more than you would have if you hadn't sold it, and at the same time prevented the developer from seeing some amount of money for their game. When someone pirates a game the developer doesn't see the money, but you don't gain money in return either. Basically you end up with more money while the developer sees the exact same amount from whoever got it after you if they pirated it.