6. Batman #1 ($534,000)
The first number of Batman, the answer to the question “Who he is, and how he came to be”.
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By this point Batman and Robin are established characters and the comic is still going today.
They began the story by presenting us a mugger named Joe Chill who accosts Thomas and Martha Wayne and their young son Bruce.
We all know the story from here; the guy shoots Bruce’s parents and leaves Bruce alive and alone.
The following years find Bruce different. With the vow he made when his parents died, Bruce find himself developing his mind and body in order to revenge his parents.
He became Batman when a huge bat flew into the window while he was sitting at his father’s desk. From that point, Bruce it was no longer Bruce and became Batman.
If you want to find out the rest of his adventures, you can pay $534,000 and buy the comics.