Artifact collectors of modest means collect small things like coins and stamps. If you have money, however, you can think big. For most collectors, this means high end artifacts (like the Athenian Decadrachm described below). For some, however, thinking big is taken more literally. Jacques Littlefield, who just passed away, was just such a collector- he collected tanks! For his obitiary, see: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2009/01/13/BAHA157UND.DTL
I once saw a documentary about the restoration of the WWII Panther tank described in the article. It was a hugely complex and expensive job restoring the vehicle that had been sabotaged by its own crew before fleeing the advancing Russians and then had lain underwater for decades. Only collectors with the financial means and patience of a Jaques Littlefield would have attempted such a task. Hopefully, his collection will be cared for for years to come.