i don't agree with this in the slightest - for a couple of reasons.Matt_B wrote: As such, sales of pre-owned games are potentially piracy by the back door. That's not to say that everyone who re-sells their games will have kept a copy, but I'm sure that enough people do for it to be a significant factor.
Firstly, the people you are talking about bought the game in the first place and made a copy. So the developers got their money. By then passing on the real copy to a game store, the game store makes more money reselling it at a discounted rate. Which means the game stores make more money and have more money to market NEW games. Note that brand new pre-owned games very rarely have much of a discount, if any...and for one or two pounds almost everyone i know would buy new rather than pre-owned.
Second, pirates will always just find another means. Most people who use copied games (although i don't know anyone who does so for this generation of games i have to say) download files through torrents. They don't need the physical disc at any stage...only one person needs to upload a torrent and thousands can access it in days. Chances are that person rented the game anyway, much cheaper to do it that way.
Stopping pre-owned game selling will not, in my opinion, change the amount of piracy one single iota. It won't make any difference at all. The only kinds of pirates that would do so in such a manner are ones that are pumping money into the 'system' anyway - in the sense that they are buying full priced games, and then letting game stores resell used games.