It shows how bad at economic these companies are. It all depends on the total cost. The cost to play a game is what you pay minus what you can sell it for. If a game coss $70 new but you can sell it for $40 in a month the cost to you is $30. That is what you are willing to pay. If they kill the second hand market then the real cost will be $70. You will now sell a lot fewer games because if the higher price. If they kill the second hand market but drop the price to $30 they will sell about the same as before. Now the trick is to figure out which gives you the highest total revenue. I don't think DRM is going to help.