Wow, a more measured and rational response on CAG to this news than on some websites like Ars Technica and Destructoid. Honestly, it's unfair that you can buy a used game and play online and force the publisher to subsidize your online play (maybe XBL is a different story, I don't know how much of that $50 goes to the servers, etc.).
I've seen a lot of different opinions about this, and there are a few good arguments for why this is a money grab by the publshers/developers:
1) If I sell my game to another person, they're just taking my spot online. I stop playing online and they start playing online, it's a zero sum.
2) They've already sold the game new and this is just double-dipping.
3) I'm selling the game to buy more new games.
Well, take this analogy: let's simplify this and say that a game server costing $100 to maintain for the life of the game (multiply that by whatever number to come to the real cost). Now, if I expect that I will sell 10 games (times whatever multiplier to come to the real amount I think I'm going to sell) at $60, I can spread that $100 out to among all the games I expect to sell, it means that $10 off the top of each game I sell will go towards paying off the server (the rest of the cost for R&D and testing, marketing, and profit, etc., are also factored into the MSRP price); I just need to sell at least 10 games to make up my costs to break even for just the online part.
Now, if I manage to sell only 5 new, and then the rest of the 5 are bought used, then I'm screwed. I only got $50 the cost paid for, and I have to eat the rest (not to mention, I didn't really cover the development and other expenses either).
So, this is why the publshers are doing this. If you buy the game used, they're going to charge you the $10 (from the analogy) that they're losing on the used game sale. It costs them nothing extra if you buy a single player game used, (except the loss of all of their investment in making the game itself). But an online game, they're paying the cost either way, whether it sells or not. It's just not fair for GameStop to grab the cash by strongly urging your customers to buy the game used; and likewise, it's not fair for the publishers to maintain these servers for people who aren't even their own customers, so, they had to devise this scheme. Now, if GameStop would have cut some kind of deal with the publishers to cut them into the equation somehow, we wouldn't be arguing about this. So it will either come down to you getting charged for the online services, if you do not pay your fair share, or only being able to buy it digitally.