Example: lots of people I know torrented Game of Thrones because paid services were actually worse. Things like HBO Go stuttered depending on internet connection -- and in one of the season premieres, the service was unavailable -- while torrents offered Full HD quality with no surprises.

Another consideration is when you're paying for Netflix but it doesn't have all the seasons of a series yet. So people torrent the episodes even when they are already paying for a streaming service: torrents are more convenient. They get all the content when they want it, and with high quality too.