Superman Charity vs. Kryptonite Inc.

Thomas Denton wanted to raise money for cancer. He did so by enlisting the services of several professional and amateur comic book artists, who drew original artworks featuring famous DC comic book heros, then selling them on Ebay with the proceeds to go to the charity.

But just how wrong was he to do this without the permission of the super hero copyright holders? I argue on that he was not at all wrong.