Because Blu-ray adds to the price of each console manufactured and doesn't give huge returns on investment (Discs are probably sold just above manufacturing and content costs leaving little for Sony), whereas Live/Marketplace make visible cash that far outweighs (subscriptions and purchases) any mimimal server cost.
Expensive blu-ray means expensive PS3 means low sales and low RoI and/or losses.
Sony was even losing money on PS2 when it was the world's most popular console ever: how bad will it be now?
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If you are interested in trying Ubuntu or Linux in general, PM me and I will answer your questions and help you install it if you wish.







