Well, first off the games cost more, so the 2nd hand games will be more expensive. Also, I think you need to hunt for the bargains. I bought a brand new Halo 3 for $28 last week on eBay, and its pretty easy to find a good deal on game lots on eBay.
Bethesda's Todd Howard "if install base really mattered, we'd all make board games, because there are a lot of tables."
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