Because it's not zero-sum. There are plenty of incredible sources of leisure, entertainment, or culture outside of what HBO produces.
Not to mention one can wait for the shows to be on Blu-Ray.
Not to mention one can wait for the shows to be on Blu-Ray.
No blu-ray releases where I live, I don't know anyone who owns blu-ray and don't have one.
So there is no reason to not torrent them.