If a developer sees their game selling for $30 consistently on ebay they can do things about it. offering more on the disc lowering the price coming out with special edition bundling it with other games. how can a developer see how many people are prating the game? With the used market the know what people are willing to pay for the game with pirating they only know there are people not willing to pay. Pirating doesn't show the developer what people are willing to pay for the game the used market does. The developer can work to get the money people are spending on it used. The developer has no idea what I pirate would pay only what they wouldn't pay.
I can get a copy of bioshock new for $18 if there were no used market it would most likely be more not $60 still since the demand for the game isn't that high.
I would bring up other arguments but since many are what pirates try to use I see no point. I see a big difference between getting a copy of the game the developer made and creating my own copy. The used copy that I buy I know they made. One could try and say this with pirating but you are only copying a copy not one that was made by them. Someone had to upload it to begin with and hack it but at that point it's no longer the one the developer made and a copy or a hack. The disc I buy was a disc they made.
Also after the game gets made it's not longer the developer g
