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The goal is to make money not make Sony lose more. Blu-ray add-on = money loser. I don't have time to play all the games on one platform, I certainly don't need to own both just for a few more.
What if blu-ray add on = revenue w/o any profit, but not loss. Each customer they share with Sony is equal to sharing their revenue from 3rd party games with Sony. If you are going to buy a multi-platform game and have both platforms at home, you are going to choose one of them, right?