I like to watch movie twice a month and I always buy dvd of that movie afterward

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I like to watch movie twice a month in cinema and I always buy cd or dvd of the movie that I watch afterward. I really don't understand when I like the movie even though I already watch it I still end up buying it since Its end up that I don't want it again. I mean I just put it in some cabinet and keep it their and no plan of watching so I don't see the point why I need to buy cd or dvd but I still do. lols.