Otaku Itch
When someone who is not an Otaku but fond of anime/manga feels the need to buy everything related to their favorite anime/manga once it goes out of print. Usually due to a fear of an extreme increase in price.
Oh shit, Bandai dropped Tengen Toppa Gurren Lagann, I better buy all the DVD from Amazon before their value increases. My Otaku Itch is acting up.