Old comic books are now among the recognized investments. Some hundreds of millions of dollars can be paid for the rarity of some of them.
See for example this FLASH COMICS offered on Ebay. And there is no exception at all, there are several similar ones: http://www.ebay.com/itm/FLASH-COMICS-1-ASHCAN-EDITION-CGC-9-6-1939-/122319959353?hash=item1c7ad67539:m:mP1rDfs2WYY1n1QN2C32soA
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