I bought it for the house building stuff, not gonna lie. There is no quest line, but in my original house in Whiterun, I had that sucker all decked out with my trophies from quests. All my Assassination trinkets, Cicero's clothes a book on the Dark Brotherhood, and my contract notes. I also had a bunch of fancy weapons in racks and bookshelves filled with books and spellbooks I randomly stole from different places.
It was sweet.