Used games market is necessary to fund an important share of buyers and make them buy new games. The only factor fucking it all up is GameStop, paying them too little to previous owners and doing everything thet can to sell them just cheap enough to "steal" a new game sale, this way old owners are funded less to buy new games, new owners are squeezed more and almost all the money goes to GameStop, basically GameStop is exploiting the market, taking the lion's share of the it and screwing both gamers and publishers/developers.