Super Prices for Superheroes

"Kapow! Comic books are no longer just kiddy lit. Far from it. The numbers speak for themselves. In March 2010, Action Comics #1—the first appearance of Superman—sold for $1.5 million on an online auction site, making it the most expensive and valuable comic book of all time." -- Jonathan Shipley

STTA. Based on your own experience, what's your sense of the appeal of comic books? What did you collect as a kid? What would you like to collect now, if you could afford to?