I think the largest problem with the attack on the secondary sales market and piracy in general as well is that games are often far too shitty to pay full price for. I fully admit that I have pirated games to try them out. If I like the game, I buy it to experience everything it has to offer; if the game sucks balls, I don't buy it. Why should I have to gamble $60+tax/shipping/gas just to try out a game that doesn't have a public demo? I can't buy a game, try it and return it if it sucks, they have return policies that strictly prohibit returns for refund on opened games because of codes like this, or piracy. If I were to instantly turn around and trade in a game used, I could at most get back what, 30% of my investment? In my financial situation, I have to spend my entertainment dollars wisely (hence MMO, best bang for buck) so I don't risk spending the money on potential wastes of money. I know I'm just justifying a crime, but let's be honest here, it's a crime that only hurts the shitty game makers. I don't go making copies of the pirated games and hand them out to my buddies, or even host torrents after they finish dl'ing (bad practice, but I suppose I'm not a nice pirate). In my eyes, my only crime is sticking it to the people who push out rushed or near unplayable games that really don't warrant the price tag.
I also am interested in the comment that "this will reduce the number of ____ '09 sitting in gamestops" but just the opposite. They'll still accept the trades, but people won't buy them quite as readily. Also, prices will drop quickly as they get traded in. When gamestop only pays 3 bucks for a 60 dollar game, only to resell it for 45 and 10 bucks for the online access code, I could instantly see that this was a profiteering scheme concocted to swindle parents or significant others making a heartfelt purchase only to find out there's more to buy. I kind of relate it to buying a blu-ray player for someone and not giving them the HDMI cable to hook it up. Sure you have a player, and it can be hooked up with what comes with it, but what's the point without HD picture? It's the very "batteries not included" marketing that has been around for ages and only seems to adapt itself to every form of sales.