But Tom, games do lose value. An used game is not the same as a new one when talking about physical products.
Like any other product, it loses value. The moment you take off the pretty plastic from the box, the game is no longer considered "new" by many, and as such, it loses value. Depending on the state of whole package, it devaluates.
On a game with 1 month on the market...
Everything looks new, except that it just isn't? All right, $50.
The box is scratched, dirty, and bitten? $40-45.
The disc has minor scratches? $40.
The disc has mild scratches? $35.
No package at all, just the disc? $30.
Just to give some examples. The dollar cost isn't exact, but you get the idea. Will the content of the disc be the same, no matter if used or new? Yes, but the game loses value no matter what. The crappier the game, the faster this happens.
The whole "used games are killing the industry" seems like a load of bullshit. Just like the piracy argument. Instead of rethinking their current business model that is about spending a shitload of money on marketing and hyping the game to death, just for it to suck, publishers blame everything else and punish their customers.
They try to pull the "you don't own the game, it's just a license!" and yet, if my game breaks, scratches to death, etc., are they going to send me a new one or allow me to download it? After all, it's a license! Of course not. They don't give a fuck, they got my money already, the short-sighted assholes. Good thing digital works this way, but we're talking about physical right now, where the used market is.
When and IF the market goes completely digital, I can see the used game market dying. But only if the cost of games is lower, if not, I see the industry losing sales. Many still put the $60 tag on a new game on digital form, just for shits and giggles. There's no longer a manufactoring process for the boxes, the discs, the manuals (what little of them they include now), the shipping, etc. But fuck no, I want to get my moneyz, so $60 it is.
And then, used games even work as a form of "marketing" for them. I'm not the only one that sells games to buy a new one. I'm not the only one that bought a cheap, used game, and later bought the sequel or its DLC. (I bought Skyrim, because I bought Oblivion used years ago). The used market is made out to be the devil, but it's just part of the industry. They lose some sales from it, but they also gain another ones and even new customers.
My reaction if there's no used game market, rentals, asking a friend for his game, etc: I see a $60 new game but I hold back because I don't want to buy it for it to suck. I buy it when it's ata $30. Or I wait for the ZOMGS EPIC GOTY EDITION COCK pack with all the content for $20 later. Meanwhile, publishers will just keep blaming piracy for shitty sales. Not their anti-consumer pratices, not that the game fucking sucks, not that the game was rushed. Can't blame the used market now, I guess.
@Metal: I don't know about cars, but he compared it to comic books and clothes in the beginning.