I grew up watching the movies, to this day I still enjoy spending a sunday afternoon watching the original trilogy. I appreciate them because the story is classic and still very fun, and they were a huge step for the science fiction and fantasy genre in movies.
I never followed the extended universe, I never got into many of the books.
I did buy KoToR because it was a Star Wars video game and looked neat, I absolutely fell in love with BioWares style. I loved the story telling, having control over the conversations, it's still my favorite way to play a game and I replay KoToR from time to time just because I still enjoy it.
So I guess I'm playing ToR because of a ton of combined reasons. I want to play a Star Wars game, I'm specifically excited its BioWare doing it and using the KoToR related universe, and also I'm very ready for something fresh in the MMO world to grab my interest.