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Some fandoms are temporary. Many addictive TV shows, for example -- "The Sopranos," "Lost" and "Battlestar Galactica" -- have intense followings for the length of the series, but lose steam within a year or two of the series finale airing, leaving only a hardcore group of devotees to debate, draw, discuss the minutia of the characters and plot developments. But some fandoms, they're seemingly forever ("Game of Thrones," "Star Trek," "The Lord of the Rings," "Star Wars"). That's what the Harry Potter fandom is like. It's basically the Mafia. You think you're out, but then something happens to draw you back in.

Potterheads can try to leave, but you kind of can't, not really, not when there's Diagon Alley to visit, Ron and Hermione to defend, stamps to collect, and a new prequel to look forward to on the West End. Here are six reasons it's "Harry Potter Forever" in the minds of many fans.

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