ps3 games arent on piratebay because noone has figured how to break the ps3 encription yet, not because sony got anything right in their sales model. In fact MS was first with the DLC and minigames thing.
I would also argue that PS3 using BluRay for their games would have an impact on that as well, even if the encryption were broken. Speaking on behalf of myself anyways, burning dvds would be far cheaper and more convenient.
"If truth is beauty, how come no one has their hair done in the library?" -- Lily Tomlin