Are used games killing the market?

[kn]

I must admit, I love buying used games from gamestop.  They ran 3 separate "Buy 2, Get 1 Free" sales this holiday and I took advantage of them along with my edge card (-10% on used).  I ended up paying about $33 each for LBP, Gears 2, and Prince of Persia on the last sale.  All three were in perfect condition with manuals -- no scratches.  The PoP was actually the collector's edition and has a second disk in it with other "stuff".

I have actually bought alomost every game in the last 6 months through GS's B2G1 offer with the exception of Animal Crossing Wii and Lips.

I was in Gamestop last Friday and noticed a number of AAA games that were WELL stocked on the Used shelf.  There were probably 4 Gears of War 2, 10 GTAIVs, and multiple other newer releases.  On the PS3 side, they had about a dozen copies of MGS4 all the way down to $29.99 as well as a couple of LBPs and Resistance 2's.  I was back this week and the VAST majority of late release stuff had been snatched up in their final B2G1 free sale of the year.

That is a LOT of missed opportunities for developers...  Even though I participate in those smoking deals, I believe this practice needs to end for the viability of the industry...