I have always wondered about the differences between buying second hand games and buying it completely new and sealed. Of course buying second hand games would mean saving more money. This applies greatly on console games. After finishing a game, selling it would mean an additional sum of money in my pockets to prepare for purchase of the latest games. Also, buying second hand games would mean more games but lesser money. However, it is known that by buying second hand games, it would mean that the game developers are not going to earn additional money from you. Good or bad? In my opinion it is great for not only the consumer but the producer as well.
Now comes the third category which most probably does not apply to current generation consoles (yet). That is pirating games. Easily downloadable off the net or bought from street tenders, pirated games are always hot among gamers. However, for current generation games (PS3 and Xbox 360), piracy have yet spread to it.