Oh dear I guess I shouldn't respond to this but whatever!!
I have been a Harry Potter Lego collector from the very start. I have most all of the original sets and even a number sets that aren't even opened yet like Dagon Alley, The Burrow and a small Hogwarts Castle extension. My collections include The Castles (3 or 4), The Quidditch Pitch, Aragog, Chamber of Secrets, Prisoner of Azkaban, Hagrid's Hut, The Grave Yard, The Herbology Classroom, The Durmstrang Ship, The Night Bus just to name a few, as well as numerous small sets. Sadly Lego didn't offer any sets for the last book.
I also have many other Harry Potter related items like watches, pins, scarfs, sweaters, t-shirts and miscellaneous items.
I used to have three tall glass cases with just some of my sets and treasures, but once I moved from the East coast to the West coast of the USA I sold them. All my older sets are now in boxes waiting for me to find new ways of displaying them in my smaller apartment. I can't wait for my two grandchildren to get older and start to learn about the Harry Potter books and enjoy all the Harry Potter Lego Sets I will allow them to play with.