Some of the keys to successful card investing include buying rare, good condition cards of established players, said Bart Brewer, an adviser at Global Financial Advisory Services. “Even though you don’t have to be super-rich to do baseball cards, if ...

In April, a comic books investor paid a record $3.25 million for a high-grade copy of “Action Comics No. 1,” the 1938 issue that introduced Superman to the world. The seller had bought the comic book for just over $2 ...