I use the internet because 1. There is no way I can afford all the anime I watch (though I try to buy the anime I really like) 2. Its way more efficient to watch more anime over a period of time 3. Its so easy (except when there's a certain anime or episode that's like impossible to find)
I prefer physical copies for the manga I really love (its so expensive) and I can read them faster also i like that unexplainable feeling having physical manga, and looking at my bookshelf and grining with pride.
Mine was prebuilt but I have a friend that built his own and since I saw how much better it runs than prebuilt computers I want to build my own........once I have the money.