They do it to build post counts until they can post spam links. It also lets them get by longer before being spotted. I am like many here. I don't for the most part rewatch content. There is too much out there I am interested in seeing that I haven't seen. As far as streaming, I prefer my content locally stored since the trickplay is more responsive. I tend to fast forward through various segments in movies and TV so responsiveness and accuracy is very important. I also like to see what I am skipping rather than how Netflix buffers.