Batman Lego's are some of the more desirable Lego sets out there and many of the discontinued Batman Lego's are entering the category of rare Legos.
The popularity of the recent dark knight movies has helped increase demand for many Batman Lego sets. The Lego group has done a magnificent job of making classic Batman Lego sets that have remained true to the comic feel that Batman should embody. Coupled with Lego's insistence to discontinue a Lego system after a certain amount of time has passed, this makes many of these Lego sets highly collectible.