In the last day or so, a lot of people have been weighing in on this debate, mostly due to the latest Penny Arcade comic and its attendant news post. I thought I'd throw in my two cents as well. 

It seems like everyone is saying that they have no problem buying games digitally, but kind of hit a wall when it comes to buying physical games at full price. Some might say that there’s a discrepancy there, but I think it actually speaks to the value of buying games digitally. Usually buying games digitally is cheaper, and you can be sure that the money is going straight to the developer, instead of the middleman (like Gamestop). Not to mention the fact that most digital download services (Steam, mostly) have crazy sales all the time that make it totally worth your while to do your games buying there. I personally don’t like buying used games mainly because I don’t approve of Gamestop’s policies, but if someone else feels differently, that’s totally up to them and also totally okay. As a lot of people have mentioned recently—mostly in reference to the price/value ratio—it’s up to the individual consumer to make his own choices, and those choices need to be right for him, what’s financially responsible for him. If I have enough disposable income that I can buy new games at full price and not be hurting, then that’s awesome. If some working-class dad has to worry more about providing for his family than getting Halo on launch day, then it’s better for him to buy it used a month or two down the line. He’s not a bad person just because he’s worrying about his own financial well-being before the company’s whose game he’s buying.
 
ADDENDUM: It seems like a lot of people commenting here think I'm railing against used game sales in all forms. Some have said, "But what about (insert game)? It's 10 years old. How else am I supposed to get it?" I think the debate here has more to do with recent games, as opposed to older games. Obviously, the only way to get that copy of Radiant Silvergun or Chrono Trigger is to find it used somewhere, which as I noted above, is fine.