good question and I'm not advocating putting GS out of business for that reason alone (selfish).
But, I can see why some pubs are attaching these freebies to new games only. all I'm saying is I don't blame them.
Neither do I. However, apart from the effects of used game market discussion, as a consumer I have to question the direction. What's stopping them from moving some (or maybe more) of their disc content to one-time free DLC to promote early new disc sales? It would practically reduce the trade/resell value without an appropriate price drop. How much far will they go?
As some one who don't really buy/sell/trade used games, I'm all for digital distribution, but only if it's significantly cheaper than the disc. I'd think the posters who actually traded games, would be against this move all together.