Is this poster really worth a lot, Holiday?
I've been wanting to talk about this for a while, actually.
In ten years, I wouldn't be shocked if Harry Potter posters are some of the most valuable on the market. Whether you like Harry Potter or not, it's a worldwide record-crushing phenomenon delivered to its enormous fanbase ingeniously. The staggered release of books and films meant every chapter of the franchise was a multimedia experience that spanned a decade, so the bulk of its fans literally grew up with HP as an annual event.
1st Edition sets of the books are already worth a thousand dollars, several thousand in the case of the UK prints. The sensation of today is the memorabilia of tomorrow, and the way this series has reached and affected people is unlike anything I've ever seen. The sheer immensity and quality of the entire Harry Potter project has guaranteed it a place in the history of both film and literature and studios and publishers have been attempting to replicate its success for as long as it's existed.
I don't like HP much either. I only read one book and, while I enjoyed the films,I prefer to pick them apart as generally poor adaptations (the third of which is superb and the rest of which are weak). But pretending its impact on people, pop-culture, literature and film has been anything short of incredible is, like you said, naive.
Granted they were both to the same user, but I think it's worth noticing that two posters from 2001 both sold for $300. People collect what they grew up with, and the digital children are growing up. I mean, just look at me! I'm no expert, but I say stock up.