I think offering a discounted serial number for used copy purchasers is fine.
The problem people are running into is, imo, unfamiliar territory. Most* game companies use CP and have for a long time. Everyone is used to CP instead of serial number security. If serial numbers and no re-sell had been used from the dawn, it would not even be a question.
Frankly, I am glad to see a company moving in a new direction and with it's sucess, hopefully in a few years (cough) this will be common knowledge.
I would rather have a game I can't resell than to have one with draconian copy protection.
That being said, I disagree with the EULA about resale. I should be able to re-sell ANYTHING I bought through legitimate channels. I am certainly not talking about piracy here (where you make a copy and sell the original). I am talking about an honest resale of a game.
For example is my situation. I bought the game (at a store) but had quite a bit of trouble running the game because my computer has a graphics controller and not a video card. I had no idea of the differences between the two. I am not a computer guru, nor do I have the desire to have to learn a new carreer just to play a game. Fortunatly I was able to get a new computer (was needed anyway) so system requirements are no longer a problem. But in absence of that, I would re-sell the game to someone that had a computer that could handle it. Being denied the ability to re-sell a good game I can't use because of my computer is like kicking someone when their down. You can't afford the game at walmart? awww, TFB for you.
The argument that they didn't make any money from the resale is moot. They made their money from the original sale, why should SD care who is playing the game as long the CD was obtained through non-pirated methods. It just seems to me their position regarding resale flies in the face of how SD handles everything else regarding this game.
If I did have to dump the product, I certainly would take whatever measures were necessary for the new ower to be able to get it going (email SD to reset the number, whatever) but that is me. I know most people would not go that extra mile. If they did, none of this would be necessary. Damn Terrans. Can't trust them with a postage stamp.
I realise both positions appear conflicting so in a nutshell, I understand why they are handling it this way though I don't necessarily agree with it. Anti-piracy measures and the legitimate re-sale of a product are two seperate issues that have been combined, sadly so.
I am not asking SD to reverse their current position. Just that they keep an open mind for other possible solutions for future games. Right now it flies, but lands like an albatross. It's a good idea that needs a lot of refining, imo.