1. You're paying for single player games. not that its a bad thing, they are two excellent games, but less replayability.
2. They probably don't work with steam or anything else for that matter.
3. Mail in rebates are scams
I'm currently running 2 GTX 460's in SLI they are great. This reported deal is a bit late though as I have gotten in just last month. The price I ended up paying for each was $160 after mail in rebate. The $10 difference now (I actually got the Gigabyte version which I would prefer anyways) doesn't seem to warrant pointing it now from them.