From left: Vincent Zurzolo is president of New York-based Metropolis Collectibles. A restored "Action Comics #1," graded 9.0 and featuring the first appearance of Superman, broke the record for ...

An issue of "Superman" recently sold for a record-setting $9.12 million at auction. Whether or not your old comics can reach that price point depends on multiple factors.

The world of comic book collecting has transformed from a childhood hobby into a serious investment market where single issues routinely sell for millions of dollars. What once cost a dime at the ...