Because if I'm deriving worth or entertainment out of something, I feel the creators of it deserve my money. Their product was good, the fruits of their labor delicious. For instance, I didn't have HBO Go in the past, but I love Game of Thrones. There are plenty of streaming services for free on the internet that allow you to watch TV programs. But I really enjoy Game of Thrones, I think they did a great job with the series (though the books are better). So instead, I purchase the seasons on my XBox noting that some portion of that sales has to go to the people making the show (and some other portion goes to the growing pile of money I've given to Microsoft over my lifetime). I also buy the Blu-Ray collections too. If someone does a good job, I think they should be rewarded.
But if their fruits suck, I'm not going to pay for it. I likely won't consume it, but I've torrented some horrible movies in the past to watch. But there can be other stuff that has such bad service that I say "fudge you" and pirate it. Sports for instance. I don't have regular TV, so I cannot watch baseball or hockey, things I really enjoy. I used to buy NHL Ice and whatever the same service is for baseball. But have you seen the blackout dates on that stuff? I hadn't quite anticipated just how ridiculous they go to shut you out of service after you purchased it. I used to live in New Jersey, and there even Pirate games were blacked out for being in a "local market". Not sure how Pittsburg is f'n local, but that was the claim. I bought NHL Ice to watch Redwing games, and then they black out all sorts of stuff. Nationally televised games and such, but I ain't got cable, it's why I got the service. But I got pissed off. Missed too many Cubs games too many Redwing games because those jerks blacked me out of so much, unreasonable crap. So fudge them. I stream the **** out of sports games now. I'm not paying hundreds of dollars to be blacked out of games I want to watch. Their service is ****, and they get nothing from me (not that they care, they're making money hand over fist).
I also torrent fan-subs, but that's because I can't get that stuff here in America. Also, as much as I love One Piece or Bleach or Naruto...I'm not buying those Blu-Ray. There's hundreds of episodes, it would cost a small fortune to buy them all.