well Avatar had the advantage of novelty-- it was the first movie ever released in modern 3D technology, people who never cared much for that genre went to go see it anyway just to experience what the fuss is about. cant also deny that bandwagon factor pitching in the box office. the bandwagon mentality can be used to HP DH2's advantage-- compel people to watch the last film of the longest running, most successful franchise in history.