While I agree with you that I wouldn't want a piece of "sidekick" memorabilia, you did make it sound like you had no idea that this was from the movie. I think the reason they chose this instead of the Joker is because this actually is a mask in the movie, while the Joker is paint on a human face. This was probably a lot easier to make because it doesn't have to look life-like, as a face would.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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While I agree with you that I wouldn't want a piece of "sidekick" memorabilia, you did make it sound like you had no idea that this was from the movie. I think the reason they chose this instead of the Joker is because this actually is a mask in the movie, while the Joker is paint on a human face. This was probably a lot easier to make because it doesn't have to look life-like, as a face would.